4) Barcelona
A long way from the side that dominated the Champions League from 2008 to 2011, Barcelona could really do with making a statement in Europe this season after more criticism of their form in La Liga this term. With the likes of Lionel Messi, Neymar and Luis Suarez in their ranks, surely the Catalan giants can start to show their true colours and get past a Manchester City side that tends to choke on the European stage?