Watford goalkeeper Ben Foster believes he can play into his 40s.

The veteran keeper turns 36 in April, but has been in fine form so far this season.

He said: "I can carry on for as long as I want. I feel brilliant.

"I have always said about my knees, but touch wood they have been brilliant lately and so two, three, four more years.

"I'm trying to get to that 40 year mark. I'm training most of the time and I'm enjoying it.

"I was with Van der Sar at United and when he actually signed for them I think he was 35 and he learnt how to look after himself properly and he knew how to make himself fit for the Saturday.

"I watched him go year after year after year and actually when he retired he could have gone for another two or three years, I think he just got bored in the end. He was too good and I learnt a lot from him."