4) Pedro, Barcelona
With Luis Suarez, Lionel Messi, and Neymar forming the best attack in world football at the Nou Camp, the Spain international has found himself on the bench more often than not. The 27-year-old has won everything there is to win, and would be a great addition if United can take advantage of his situation in Catalonia. The recent signing of Arda Turan could push him further down the pecking order there.