Ole Gunnar Solskajer says David De Gea has his focus back after signing a new contract.
The goalkeeper committed to the club for another four years on Monday.
And Solskjaer was always confident the Spaniard would stay at Old Trafford.
"Most of the time we get to keep the ones we want to keep," said Solskjaer.
"The more I got to listen and speak to David, I was pretty confident we were going to make it.
"David is delighted. I think you could see by his performance [in the Premier League win] against Leicester that he had made up his mind. You could see the focus in his eyes again.
"You do feel very secure with a focused David behind you.
"He's really worked hard this season. He's still young. Edwin [van der Sar] signed for us when he was 35, so I'm sure David will be part of a successful United team."