West Ham United have bid a club record €30 million (£27.1m) for the highly-rated Sporting Lisbon midfielder William Carvalho.

Club representatives are currently in Lisbon attempting to close the deal for the Portuguese international and negotiations have been going on for more than a week. Sporting are attempting to hold out for €40m (£36.1m) but are aware that the 25-year-old is keen to finally move to the Premier League club.

Signing Carvalho would represent another huge coup for West Ham who have already signed Marko Arnautovic, for a club record fee that could rise to £24m, Javier Hernandez, Pablo Zabaleta and Joe Hart during this transfer window as manager Slaven Bilic re-shapes his side ahead of Sunday’s kick-off away to Manchester United.

It is not thought that West Ham will go as high as €40m for Carvalho but talks remain positive between the two clubs and sources close to the deal are optimistic it can be done.

The highly-rated midfielder, who has been linked to a number of big Premier League clubs in recent seasons, including Arsenal, is understood to be aware of the fact that he needs to move to further his career.