"We have never asked for a bid, we have never put a price on him. He's really important to us. He is not for sale."

Sunderland manager David Moyes has made his thoughts perfectly clear on the future of star striker Jermain Defoe in the face of serious interest from West Ham. He is going nowhere.

And here is why the relegation-threatened Black Cats are desperate to hang on to the 34-year-old former England international...

He's scored 58% of their league goals this season

It would be unfair to describe any side as a 'one-man team', but it is clear Sunderland are heavily reliant on their top scorer - more than any other Premier League side.

Defoe has scored 11 top-flight goals this season - more than half of his team's total of 19.

No other player in the division comes close to having the same influence in front of goal.