The former England midfielder, 36, who joined United from Tottenham in 2006, will take on a role among Mourinho's back-room staff this summer but admitted his ultimate aim is to become a manager in the future.
"I know football fans get frustrated and annoyed and want to see xyz come to your club, but the turnover of players is ridiculous".
"I don't care how good the players are, it's all about experience, it's about making mistakes along the way and coming up against these players week in, week out and knowing how to prepare to play next season and the season after that".
The Portuguese manager will know a trip to the Capital will be hard for his team, with the Hammers wanting to finish strong as they know they could finish as high as 10 if they win their two remaining matches.
'For now I'm at Manchester United, I really only think about the present.
Shaw hasn't been the same since suffering a double leg fracture two seasons ago, and it seems Mourinho has no patience left for the left-back, who has had to sit on the sidelines and watch Ashley Young do his job for him.
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The news comes as a blow to both Liverpool and Gomez himself, with Joyce adding that he is likely to miss this summer's World Cup.
He told reporters: "How many points separates us from Man City? So in this moment, for me, he is staying".
"I trust some more than others that they can bridge that gap".
Red Devils fans will likely be pleased at this indication that two young, unsafe attacking players are in the manager's plans for the cup final as they haven't always been regulars throughout 2017/18. He is the coach, he's going to make choices and I as a player, I accept them.
'Unless there is a flawless squad where you buy one goalkeeper, you don't like and you buy another one.
Unless you can do that, and you go in the direction of the flawless squad, you have to keep players you don't love and players you don't totally believe have the level of the squad.
The Reds will look to sign off the 2017/18 league campaign with a victory on Sunday, with kick-off at 15:00 BST at the Theatre of Dreams, ahead of the Emirates FA Cup final against Chelsea at Wembley on Saturday 19 May. He has had a major doubt on the mental state of his team, post stating that something "doesn't smell right" within the club.