By London correspondent Tony Hughes

Follow us on Twitter @footyinsider247

Manuel Lanzini has signed a six-year West Ham contract, according to joint-chairman David Gold.

The 23-year-old attacking midfielder has completed his transfer to the London club for a fee that is expected to amount to £7.5million.

Gold Tweeted on Thursday morning at 9.40am that Lanzini has agreed a deal that runs over six years until 2022 before then deleting the message.

This comes two days after Jack Sullivan, the son of Gold’s fellow chairman David Sullivan, had Tweeted that the Argentine had clinched a four-year deal with the option to extend for a further two years.

“Lanzini is a WHU player for the next 4 seasons, with a further 2 year option,” Sullivan wrote on the social networking site.

Football Insider revealed last Wednesday that the Hammers were closing in on the permanent signing of the Argentine.

The 23-year-old attacking midfielder has been on a season-long loan at West Ham from Al Jazira in the United Arab Emirates and has impressed sufficiently for manager Slaven Bilic to sanction a permanent contract.

The Argentine is set to more than double his current salary of £30,o00-a-week.

West Ham chairman David Sullvian revealed earlier in the season that his club had a “watertight” agreement in place to make Lanzini’s loan a permanent transfer.

Lanzini was in sparkling form before sustaining the injury shortly after Christmas. In total, he has scored seven goals and supplied four assists in 24 West Ham appearances this season.

In other West Ham news, Football Insider has revealed the details of Kouyate’s deal, which was signed last week.