Manchester United & Barcelona are both considering moving for FC Porto keeper Diogo Costa. Manchester United & Barcelona are considering a move for FC Porto goalkeeper Diogo Costa . The 23 year old is making a great impression this season in Portugal. Barcelona joined United in the UEFA Europa League last night after a 3-0 defeat to FC Bayern Munich . The two sides could eventually meet in the knockout stages due to the newly introduced rules from UEFA. Uniteds current goalkeeper David De Gea has come under scrutiny over the last few seasons due to his poor performances. The 31 year old is in the last year of his contract and there is an uncertainty over his future.