Mourinho used his news conference ahead of Saturday's Premier League game against Swansea City to pay tribute to the talismanic Swedish forward who he previously coached at Inter Milan.
"For me it's always sad when the big players move towards the end," Mourinho told reporters.
"I remember Luis Figo's last match with me and Inter, it was one of my saddest moments. The Zlatan goodbye was more in that direction, he's a huge player that European Football has lost.
"But this period with LA Galaxy will be very good for him, he will be good for American football, because of what he can do; his personality, his passion and his professionalism."
Ibrahimovic sustained a bad knee injury in United's Europa League quarter-final against Belgian side Anderlecht last April but returned to make seven appearances for the Old Trafford side this season.
"His recovery was an example of what a professional should be," Mourinho added. "For him (the move to U.S.) will just be a way to enjoy the last couple of years of football."
United will be without back-up goalkeeper Sergio Romero for the weekend's game, after the Argentine international picked up a knock in his country's 6-1 friendly defeat by Spain.
Ashley Young was also injured on international duty with England but could play against Carlos Carvalhal's 14th-placed side.
United are second in the table on 65 points from 30 games as they bid to finish as runners-up to champions-elect Manchester City.
(Reporting by Shrivathsa Sridhar in Bengaluru, editing by Ed Osmond)
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