Sir Alex accepted the Portuguese star's determination to represent Real Madrid after playing with Manchester United for six years.
The Manchester United right back, who spent the last season on loan at Italian giants AC Milan, has been an understudy to Aaron Wan-Bissaka so far at Old Trafford this campaign.
Cavani, who is in contention to be included in the squad for the Premier League meeting with Aston Villa, could soon link up with Ronaldo up front.
The Spanish shot-stopper made an incredible last-minute penalty save to deny Mark Noble from the spot in the Premier League on Sunday.
Manchester United produced a stunning come-from-behind victory against West Ham United, thanks to goals from Cristiano Ronaldo and Jesse Lingard.
Manchester United came from behind to register an incredible 2-1 victory away to West Ham United in the Premier League on Sunday.
West Ham had a chance to steal at least a point but Mark Noble failed to convert his injury-time penalty as De Gea got down to make the save.
Manchester United are coming to London on the back of a 2-1 loss to Young Boys in the Champions League match whereas West Ham beat Dinamo Zagreb 2-0 in the Europa League tie.
From Jadon Sancho struggling at Manchester United to AS Roma's unbeaten start to the season, check out the surprises of the 2021-22 season.
A decade after Sir Alex Ferguson first attempted to sign him, Raphael Varane has finally joined Manchester United and has excelled as a centre-back.