Former Everton and Leeds United goalkeeper Nigel Martyn says Manchester United's title surge is down to David De Gea.

Martyn believes United's current success is closely linked with De Gea's improvement.

He told the Daily Mail: "He's a young man coming through a foreign country, playing in a different league and it's obviously going to take him a little bit of time to adapt. "Working at it as he obviously is, it's bearing fruits now. His form has coincided with Manchester United's form at the end of the season and it's on that basis, a good defence and a good goalkeeper, that league titles are won.

"Possibly his mistakes were coinciding with the period of time that Manchester United didn't look as if they were realistic title challengers, but what has happened is his good form has coincided with theirs.

"It's probably not a coincidence that the two things have gone together and they've kicked on and really are odds on favourites to win.

"I think it's definitely his form that has enabled the rest of the team to gather their form. Goals have dried up going in and they've increased at the other end and that's always a good sign."