As we prepare to visit Sunderland on Saturday evening, YNWA looks at the careers of some of those who have represented both sides.

Current double agent
El-Hadji Diouf joined the reds for £10m signing from Racing Club de Lens in June 2002, but only netted six times in eighty games. He was sold to Bolton Wanderers in June 2005 for £4.5m after a season-long loan. He signed for the Mackems last month and is likely to make his debut against the reds in this game.

Other most recent double agents
Anthony Le Tallec spent a season on loan with Sunderland in 2005/06, having struggled to break through to the first team at Anfield. He made just 32 reds appearances, and bagged five goals in 31 games as the Black Cats were relegated back to the Championship with just three wins and fifteen points. Right-back Stephen Wright made 21 reds appearances before moving to Sunderland for £3m in August 2002. He netted twice in 105 games for them, with injuries blighting his time there, and was released at the end of last season.

Top scorers
Sam Raybould was the first player to score a hundred League goals for the reds, a feat he achieved in 170 matches in the first five years of last century. He was top scorer with seventeen when we won the title for the first time in 1901 and moved on to Sunderland in May 1907 after a total of 128 goals in 226 reds games, having helped us to two League titles and the Second Division championship in all. He notched thirteen times in 27 League outings in his one season for the North East club, before finishing his career with Woolwich Arsenal.

Joe Hewitt arrived from Sunderland in February 1904, and was top scorer as we won the title for the second time in 1906, netting a total of 73 goals in 164 reds games. He also served the reds as a coach, handyman and finally press box attendant in over sixty years' service. Sunderland-born Robbie Robinson moved to the reds from his hometown club two months after Hewitt. He was top scorer as we won the Second Division title the following season, and also helped us claim the First Division championship in 1906. During the latter stages of his time with the reds, he moved into the half-back line but still bagged a total of 64 goals in 271 games.

Other recent double agents
Don Hutchison struck ten times in sixty first-team appearances before joining West Ham United for £1.5m in August 1994. He moved to Sunderland from Everton for £2.5m in July 2000, but only lasted a year on Wearside before returning to the Hammers. He grabbed ten goals in 39 games while in the North East.

Jason McAteer signed for Sunderland from Blackburn Rovers for £1m in October 2001. He made 61 appearances for the Black Cats. Phil Babb joined Sunderland from Sporting Clube de Portugal on a free transfer in May 2002. However, he was unable to keep them in the Premiership in his first season at the Stadium Of Light, making sixty appearances in total. McAteer and Babb were both released by Sunderland in May 2004. McAteer went on to join Tranmere Rovers, while Babb retired from the game.

In goal
Ned Doig made 53 reds appearances, helping us to the Second Division title in 1905, and playing on until 1908, finishing as our oldest ever player aged 41 years and 165 days. Former reserves custodian Alec Chamberlain joined Sunderland on a free transfer from Luton Town in July 1993. He made 108 appearances for the Wearsiders, moving on to Watford for £40,000 three years later.

Mark Prudhoe signed as a professional for Sunderland in September 1981. He only made seven first-team appearances for the Wearsiders before joining Birmingham City three years later. He was loaned to the reds from Stoke City in November 1994, but never made our first team, although he was an unused substitute eight times. Bob Bolder signed from Sheffield Wednesday for £125,000 in 1983, after more than 200 games for the Owls. He never made our first team, but sat on the bench at the 1984 European Cup Final in Rome, one of seventeen times he did so in Europe's premier club competition, also doing so once in the UEFA Super Cup. He moved on to Sunderland for £100,000 the following year, playing 22 League games in 1985/86 before joining Charlton Athletic.

Also up front
Albert Stubbins was an amateur with Sunderland prior to joining Newcastle United, and later guested for them during the war. He arrived from St. James's Park for £12,500 in September 1946 and struck 83 times in 178 reds matches, helping to power us to the first League championship played after the Second World War. He was also the only footballer to appear on the cover of The Beatles' "Sgt. Pepper's Lonely Hearts Club Band" album, and became a scout for the club in 1954, a post he held for the rest of the decade. Forward Tom Scott signed from Darlington in February 1925, whom he had joined from Sunderland, making eighteen reds appearances and notching four times before joining Bristol City in October 1928.

David Hodgson joined the reds from Middlesbrough for £450,000 in August 1982. He never fully established himself in his two years at Anfield, scoring ten times in 49 appearances, although he did claim a League championship medal and helped us to clinch the FA Charity Shield before he left for Sunderland. He went on to bag five goals in fifty League games on Wearside, before moving on to Norwich City after two seasons. David Wright bagged 35 goals in exactly a century of reds games after signing from Sunderland in March 1930. He remained at Anfield until July 1934, when he joined Hull City for £1,000. Centre-forward George Ainsley played just four times for the Roker Park outfit, and guested for the reds during the Second World War.

Left at the back
Sunderland-born left-back Alan Kennedy is best remembered for his winning strikes in two European Cup Finals, but also won five League titles, four League Cups and three FA Charity Shields after moving from Newcastle United for £330,000 in August 1978, making 359 appearances in his seven years at Anfield. He joined Sunderland for £100,000 in September 1985, where he played 54 times. Dominic Matteo joined Sunderland on loan in March 1995. He played just one first-team game while on Wearside, returning to establish himself at Anfield. He played 155 games for us before leaving for Leeds United in a £4m deal in August 2000.

Barry Venison played more than two hundred games for the Roker Park outfit, including becoming the youngest skipper at a Wembley final for the 1985 Milk Cup, before moving to Anfield for £200,000 in July 1986. He went on to make 158 appearances, winning two League titles, an FA Cup and two FA Charity Shields in his time at Anfield. Scottish international left-back Billy Dunlop signed from Abercorn for £35 in January 1895, and made 363 appearances for the reds between then and 1909, winning two League titles and two Second Division Championships. He later coached for the Wearside club. Another left-back, Bernie Ramsden, arrived on a free transfer from Sheffield Victoria in March 1935. He played 66 times in a career interrupted by the war, moving to Roker Park from Anfield in March 1948.

Scots galore
Scottish international right-half Tom Morrison played 254 reds games and joined Sunderland in November 1935, helping them to claim the League title in his first season. Inside-right George Livingstone signed from Celtic in May 1902, whom he had joined from Sunderland, and bagged four goals in 32 games the following season. He moved on to Manchester City after just one year at Anfield. Right-back Donald McCallum arrived from Queen's Park in 1901, but played just twice before moving on to Greenock Morton in 1903, from where he joined Sunderland.

On the wing
Howard Gayle was the first post-war black player to represent Liverpool. He made only five first-team appearances for the reds before moving on to Birmingham City in January 1983. He moved from there to Sunderland, turning out in 48 League games, netting four times. Northern Irish inside-left Davy Hannah signed from Sunderland in November 1894. He was the cousin of Andrew Hannah, a Scottish right-back who left Anfield for Rob Roy soon afterwards. Davy struck twelve times in 33 reds games.

Cyril Gilhespy signed from Sunderland in August 1921, scoring three times in nineteen outings before moving to Bristol City in 1925. Outside-left Gordon Gunson arrived from the Mackems in March 1930 and made 87 appearances, scoring an impressive 26 times in his injury-affected time at Anfield. He moved on to Swindon Town in June 1934. Another winger, Norman Clarke played four League games for Sunderland in 1962/63 and scouted for the reds a few years ago.

Other double agents
Tom Watson managed us for nineteen years until his death in May 1915. He had led Sunderland to the League title three times, and won two more championships during his time at Anfield, in 1901 and 1906, as well as leading us to our first FA Cup Final in 1914.

England international Paul Stewart signed for the reds from Tottenham Hotspur for £2.3m in July 1992. However, he scored just three times in 42 appearances in nearly four seasons. He joined Sunderland on loan in August 1995, playing just twice in his two months at Roker Park, although they signed him on a free transfer in March 1996. He netted five times in a further 37 games, before being offloaded to Stoke City at the end of the following season.

Left-back Len Ashurst signed for Sunderland after being released by the reds. He played 452 games for the club, making him fourth in their all-time appearances list, but scored just four times. He returned to Roker Park in March 1984 as Manager, but was sacked after just fourteen months, despite leading them to the Milk Cup Final. Other double agents include 1970's midfielder Ray Kennedy, who later spent some time coaching with Sunderland, 1980's reserve Brian Mooney and Glenn Hysén's son Tobias.