Vladimir Smicer is obviously a club legend due to his goal in Istanbul, plus some other glorious moments like the last minute winner against Chelsea. So definitely isn't a 'failed signing'! But worth a mention here though because I think we never managed to find the setup to get the best out of him - nowhere near his international form, for example.
I reckon he'd fit in brilliantly in this team - in a similar role to Keita. He was great at pressing, and had an eye for a pass and goals. He didn't have blinding pace and so struggled in a wider role. But with our current set up, with width from the fullbacks and the pace of our front 3, i think he'd slot in brilliantly in the midfield