Monday's news that Manchester United have opened talks with Bayern Munich over a potential £50 million deal for Jerome Boateng hardly came as a surprise.
Having won the Premier League title in 2014/15, Mourinho faced a dressing room revolt in the following campaign, with the Brazilian seemingly being the only player to keep on giving his all.
Bayern Munich have put a €50m (£44.5m) price tag on Boateng, who is also wanted by Paris Saint-Germain.
Asked about the rumours surrounding Boateng, Bayern team-mate Ribery responded: 'I've been playing with Jerome for many years now.
Manchester United have been mentioned with just about every centre-back in Europe over the past week with Yerry Mina, Toby Alderweirald and Harry Maguire all linked with Old Trafford as Mourinho desperately searches for a new man to shore up his leaky back door. I hope he'll stay with us because he's an important player.
Goalkeeper Manuel Neuer added that Boateng "would be missed" if he left, while David Alaba echoed those remarks.
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"We were unlucky to get the Friday match", said Mourinho.
The switch in number represents Rashford's third change in four seasons as a first-team player, first being handed 39 by Louis van Gaal in his debut year followed by the number 19 the following season.
The Mirror reported over the weekend that United are ready to approach Chelsea to offer them a swap deal involving Martial and Willian as Mourinho is prepared to trade the unsettled French global to sign one of his long-term targets.
Negotiations for Harry Maguire and Toby Alderweireld are becoming increasingly hard, sources said, leaving Woodward to turn his attention to German defender Boateng, who is likely to cost in the region of £50 million.