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#4 Malcom
A rather less obvious choice given his lack of first-team opportunities, Malcom's role could, however, come as a surprise impact player.
The 22-year-old has rarely featured for Barcelona since making his controversial transfer from Bordeaux, but on the few occasions when he has played, he has shown his usefulness to the Barcelona cause, adding a different dimension to the Catalan's attack.
Given that the preferred Ousmane Dembele is out injured and a doubt for the clash against Manchester United, Malcom could get his chance to make a case for his Barcelona future and what better way than by making a statement in the Champions League?
The frequency with which we've watched them over the years means that we know the capabilities of players like Lionel Messi, Luis Suarez, Philippe Coutinho and the likes. However, Malcom offers a sort of X factor - something new and fresh, and this could make him a surprise ace up Ernesto Valverde's sleeve.
