West Ham are determined to keep Aaron Cresswell as Chelsea weigh up a summer move for the defender.

Jose Mourinho is an admirer of the 25-year-old and the Blues manager will need a left-back if Filipe Luis returns to Atletico Madrid at the end of this season after just one campaign at Stamford Bridge.

Manchester City are also reported to be keeping a close eye on Cresswell, who has shone since arriving from Ipswich for £2million.

West Ham are determined to resist any offers for the player but are reluctant to offer him a new contract as he signed a five-year deal when joining from the Championship club last July.

Cresswell is the firm favourite to be named the club’s Hammer of the Year and has featured in every Premier League match this season. He has scored two goals including a spectacular free-kick in last weekend’s 1-1 draw with Stoke.

That match saw Diafra Sakho tear a thigh muscle and although he looks likely to be out for at least a month, West Ham are still hopeful the striker will play again this season. The Hammers’ last game of the campaign is at Newcastle on May 24.

Enner Valencia was also injured against Stoke but there is a chance he could be fit to play at Manchester City on Sunday. Valencia had a scan on the foot injury yesterday.

If both are ruled out, manager Sam Allardyce would be left with just one fit striker – Carlton Cole – for the match at the Etihad.

Cole has targeted a possible move to the MLS if his contract is not renewed this summer. The former Chelsea front man, who has been at the club since 2006, had a January deadline-day move to West Brom vetoed by West Ham but his future looks unsure beyond the end of the season.

“I love it here,” said the 31-year-old. “I love the fans, I love everything about West Ham but I know all good things do come to an end and sometimes you have got to just crack on.

“I’m trying my best to put myself in the best position to have a new contract, if not at West Ham then somewhere else. I am an adventurous guy. I wouldn’t mind a bit of China or even the MLS, you never know.”