Chelsea will have to pay over the odds to bring Enner Valencia to Stamford Bridge this summer after West Ham United slapped a £30m price-tag on the Ecuadorian striker. The Hammers have no intention of selling a player they signed for £12.5m last year, despite the fact he contributed just four Premier League goals during his debut campaign at Upton Park. Valencia impressed at the 2014 World Cup in Brazil and earned himself a big-money move to England, and has also caught the eye of Blues boss Jose Mourinho during the past 12 months in east London. However, the fact the former Pachuca star penned a five-year contract with West Ham means the ball is firmly in the club's court when it comes to the player's future. Serie 'A' outfit Sampdoria have also been mooted as admirers of the South American but the fact remains that only a massive offer would convince the Hammers to change their current stance.