Manchester United have enjoyed great success in the transfer market since the beginning of the Premier League era, identifying future superstars and polishing them into the world-beaters we have come to love – and loathe.
But United have also seemed to enjoy great success in terms of selling players, with Sir Alex Ferguson often knowing exactly when to get rid of an ageing or peaked player. But he, like his predecessors, did let a few go a little earlier than perhaps they should have.
A crucial member of the United side which won the 1999 treble, Jaap Stam was ultimately discarded by Sir Alex Ferguson two years later after revelations in the Dutchman's book caused unrest. He went on to enjoy further success with Lazio and then AC Milan, for whom he was part of a legendary squad. Source: Twitter
A cult figure at United for his scoring exploits against Liverpool on more than one occasion, Forlan was sold to Villarreal in 2004. With the Yellow Submarine and Atletico Madrid, the Uruguayan became one of the world's most lethal strikers and played a starring role at the 2010 World Cup. Source - Twitter
Snapped up as a teenager, Rossi showed exceptional talent in United's reserves, but after failing to force his way into the first team he - like Forlan - left for Villarreal, where he picked up the majority of his 30 Italy caps. He has struggled with injuries, but he definitely proved himself to be good enough for United. Source - Twitter
Signed for £15m as a teenager, perhaps things would have been different for Zaha had he actually played for the man who signed him; Sir Alex Ferguson. Now back at Crystal Palace, with four goals and six assists already this season, he's finally becoming the player many expected. Source - Twitter
Carlos Tevez's departure from United ultimately came down to Ferguson balking at the asking price set by his management company. A love-hate relationship with Manchester City followed, before going on to win almost everything and is now the world's highest-paid player in China. Source - Twitter
The better of the Keane twins, Michael was allowed to leave for Burnley due to a lack of first-team football. These days he can be seen regularly performing well for a mediocre side in the Premier League, evidenced by the fact he is now a recognised international who is being linked with Everton and Chelsea. Source - Twitter
One of Louis van Gaal's biggest transfer errors. Sold to Bayer Leverkusen for just £7.3m despite enjoying a great record for United, the Mexican scored 26 goals in 40 games across all competitions last season. No United players came especially close to that. Source - Twitter
Few players in Premier League history have divided opinion quite like Nani. The Portugal winger could be brilliant one match, terrible the next. But he was never given a fair crack under Van Gaal and could certainly still have been an effective player. After all, he didn't do too badly at Euro 2016, did he? Source - Twitter
Could Depay be next? His United career has been a major disappointment. After arriving from PSV with a huge reputation, it's fair to say that he has rarely lived up to the expectations set in his homeland. He looks destined to leave sooner or later, but with his natural talent, could he be the next to prove United wrong? Source - Twitter
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Depay has been hotly tipped as the next big-name player to head out of the Old Trafford exit door, with Jose Mourinho aware of the fact that he has not given the Dutchman many chances.
Nice, Lyon and AC Milan are all said to be sniffing around the winger, waiting for a chance to pounce. So could he be Mourinho’s first United transfer regret, or has Morgan Schneiderlin already taken that title?