#2 Sergio Romero
Sergio Romero was signed for United due to wide speculation that De Gea would leave for Real Madrid. With the Spaniard's transfer eventually collapsing, the Argentine has been confined to the bench ever since, only featuring for United in cup competitions.
He was part of the squad that won the Europa League last year and started in the final. This season, however, chances have been hard to come by. Romero is by no way a goalkeeper worthy of being confined to the bench and is an automatic starter for Argentina.
The shot-stopper has made just 6 appearances for his side in the Premier League over the past 3 years. With De Gea an undisputed starter, he should be looking for a new club where he would be No.1 in goal.