And reports claim the East Londoners have launched a club record £26m move for Sporting Lisbon and Portugal midfield star William Carvalho, as reported by the Daily Mail.
The Portugal worldwide midfielder has been linked to Premier League sides Arsenal and Manchester United in the past, but sources tell Goal that West Ham are optimistic a deal will get done.
The Portuguese club are demanding €40m for Carvalho, but West Ham do not agree to that valuation and are hopeful of reaching a compromise.
A European champion with Portugal last summer, Carvalho is rumoured to want a move to England.
"He's got a £40milion release clause in his Sporting contract and that's got three years left on it".
West Ham have been beefing up the attack this summer, adding Javier Hernandez and Marko Arnautovic over the summer and breaking their transfer record on the latter.
"The breaking news is big breaking news for West Ham".
Carvalho has always been talked about as capable of taking a step up to the next level, having already played 119 league games for Sporting, and has a huge €44million release clause in his contract.
Meanwhile, Hammers midfielder Sofiane Feghouli is said to be wanted by Turkish outfit Galatasary and midfielder Robert Snodgrass has emerged as a target of Championship club Aston Villa.
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