West Ham United could lose forward Enner Valencia to Chelsea after the Blues launched a £20 million offer for the Ecuadorian, according to the Daily Mail.

The 25-year-old has a hidden buy-out clause, allowing Champions League clubs to trigger his release.

With Andre Schurrle set to depart for Wolfsburg, Didier Drogba being used intermittently and Loic Remy yet to fire, Valencia could enhance Jose Mourinho’s attacking options.

The Ecuador international signed from Mexican side Pachuca for £12 million on a five-year contract and although manager Sam Allardyce is keen to keep him at Upton park, Chelsea may lure the striker away with a more tempting offer.