United's final session on Wednesday morning was open to the public and attracted a large number of Red followers. The players were later given a short tour of the academy and were presented with mementoes of their visit.
Sir Alex has hailed the trip a huge success and he'll be hoping to see the benefits at Old Trafford on Saturday when the Reds entertain Burnley.
"It's been a memorable experience and ASPIRE’s complex is without question the best I have ever seen," declared the boss. "Not only that, the operation is so well managed that it has made our stay very easy and relaxed.
"We hope that this journey is not our last here and that it will initiate a true bond between Manchester United and our friends at ASPIRE and in Qatar."