In that case mate, just get the best sized image you can find and use is as a placeholder... this is the norm for getting sign offs on artwork before purchasing necessary imagery etc...
Sounds a bit iffy to me... surely they would just email you an .eps if they gave you authorisation. If you have, just email them and ask for an .eps file, they should oblige.
Heard some rumblings of adidas becoming our main sponsor when Carlsberg runs out, so thought Id do a quick mock up... Move the badge central, as we wouldnt need a small adidas logo... looks cool.