ST: Gabriel Jesus (£27 million to Manchester City)
Both Manchester giants were linked with the Brazilian striker before the noisy neighbours got one over United by signing him from Palmeiras for £27 million.
Given the number of players who migrate to Europe from South America and struggle to adjust to the European style of play, it wouldn't have been surprising if Jesus had hit a rough patch initially, being only 19 when he joined the Citizens.
But he hit the ground running, scoring seven goals in 10 league appearances before an unfortunate injury kept him on the sidelines for a while.
In retrospect, a player like Jesus was exactly what Mourinho needed to salvage a domestic season descending into a familiar downward spiral. The Red Devils had no shortage of creativity - it was the finishing that was letting them down.
Even though they have Zlatan and now Lukaku, Jesus' pace, trickery, movement and finishing would have provided United the best possible attacking outlet up front. The perfect target for their midfield creators.