The teams we can face are:
Barcelona, Celtic, Inter Milan, Lille, Porto, Real Madrid or Roma.
Lille would probably be the easiest and one we should put away. Porto and Roma may well represent last years Benfica, Inter and Real Madrid should see us raise our game, whilst Celtic would scrap like crazy. With the right attitude and a good result in the away leg (which is first) we have enough to put them out.
My feeling is we are going to land Barca, and that is the toughest we could get.