And Angel Di Maria, who touched down from Real Madrid in 2014, was another big flop.
United, should they sign Sancho, will be expected to unleash him right from the very beginning.
And he could feasibly strike up an impressive partnership with the likes of Greenwood and Rashford, who could play alongside him in the heart of their attack for many years to come.
Speaking recently, former United star Owen Hargreaves urged the club to end their search for a striker – and target the likes of Sancho and Leeds’ Raphinha instead.
“With Cavani there he is almost an insurance policy and you can maybe go spend the money on three other players in important positions,” Hargreaves told BT Sport.
“Cavani, if he played the whole season, he could get you 25 goals.”