Rio Ferdinand and Owen Hargreaves questioned why Jadon Sancho struggled at Manchester United after he delivered a superb performance for Borussia Dortmund against Paris Saint-Germain.
Niclas Fullkrug's goal was the difference at the Signal Iduna Park on Wednesday night in the first leg of the Champions League semi-final and Dortmund will take a 1-0 lead to the Parc des Princes next week.
Sancho was a constant thorn in PSG's side and looked a completely different player from the one who returned to Germany on loan in January after being exiled from United's first-team following a high-profile dispute with Erik ten Hag.
Speaking on TNT after the game, Ferdinand and Hargreaves agreed the 24-year-old had been renergised by a change of environment after returning to Dortmund.
'I want to know what happened at Man United. Why didn't it go well there?,' Ferdinand said.
'Is it game time or did he not apply himself properly at Manchester United? Was he disheartened because he wasn't getting game time?
'Was it the size of the club, the weight of the shirt? Is it the club? Is it the manager's fault for not getting the best out of him.'
Hargreaves replied: 'It's everything in there, it's all of those things. It's environment.
'[Tonight] I knew from the first touch he was going to have a game like that, because he had a bit of swagger, didn't he?
And that's, I think that's when Jadon's at his best, he has a bit of swagger. At United, he went safe and played back to the fullback, didn't he?'
Ferdinand added: 'That's what the frustration used to be at Man United. He's not doing that.
'The physicality of the Premier League is that, was that an issue? I don't know. But there's so many different things that you look at and go, What could it be?
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