Radamel Falcao - Van Gaal sacrificed Danny Welbeck to make room for El Tigre on deadline day in 2014 but his United career was a huge disappointment. Signed on a season-long loan from Monaco, Falcao managed just four goals in 29 appearances for the Reds. He was even worse the following season at Chelsea, scoring once. Found form at Monaco before moving to Galatasaray last summer.