Gary Neville has seen a "massive mentality shift" at Manchester United since the international break.

Ole Gunnar Solskjaer's men went into the break earlier this month on the back of a 6-1 home humbling by Tottenham Hotspur.

Since returning to action, they have gone unbeaten in three matches in all competitions.

A 4-1 win at Newcastle was followed by a 2-1 success away to Paris Saint-Germain in the Champions League.

And on Saturday, United played out a goalless draw against Chelsea in the Premier League. It was far from a classic but both sides will have been pleased to claim a much-needed clean sheet.

"I think, to be fair, the general pattern in the league of all the goals in the early part of the season, these two managers [Solskjaer and Lampard] found themselves in a situation where it started to reflect upon themselves," said Neville on Sky Sports' Monday Night Football.

"All the chances they were conceding, they looked naive.

"Manchester United are 15th in the league and it's their worst start at Old Trafford for 50 years. They were conceding too many chances and too many goals.

"If you look at the first three games of the season for Manchester United, 11 goals conceded, 18 shots per game faced, six on target, expected goals high.

"And then you look at the last two games. There has been a massive mentality shift.

"Now, before the game, the big debate was would Manchester United stick with the back five, as Chelsea went with, or would they go back to a back four?

"It's a little bit of a sideshow, actually, whether Manchester United play with a back five or a back four. The key has been what's in front of them."

Solskjaer deployed a central midfield duo of Scott McTominay and Fred against Chelsea, leaving record signing Paul Pogba and recent recruit Donny van de Beek among the substitutes.

"The big difference is that Ole Gunnar Solskjaer has gone back to what served him well last season - that 'box' of [Victor] Lindelof, [Harry] Maguire, Fred and McTominay," added Neville.

"They've all got a defensive mindset, are all quick at getting to the ball, so every time Manchester United attacked and the ball broke out to Chelsea's midfield, they were all over them like a rash.

"You look at those two [McTominay and Fred], how aggressive they are. They're on to things, they're quick to the ball, quick to react and they recycle it and try to play out.

"For me, Ole has almost in some ways thought: 'I need to go back to basics. I can't keep conceding chances'.

"He's got the issue in the stands of van de Beek and Pogba - but he has gone back to basics and it has meant they are more difficult to play against and are conceding less goals and chances."