(REUTERS) - West Ham have agreed a permanent deal to sign Argentinian attacking midfielder Manuel Lanzini from Al Jazira, according to the London club's co-chairman David Sullivan.

The 23-year-old, who joined the English Premier League football team in July, has netted five goals in the league and will complete the deal when the transfer window reopens.

Lanzini was brought in on a season-long loan from the United Arab Emirates club last July, with an option to make the move permanent.

Sullivan confirmed that the club have signed Lanzini on a permanent deal. His son Jack also tweeted that the player would sign a four-year contract.

He said: "Lanzini is a WHU player for the next 4 seasons, with a further 2 year option."

Lanzini has scored six goals in 22 appearances in all competitions for the East London side.

The Buenos Aires-born midfielder made his professional debut for River Plate as a 17-year-old and spent the 2011-12 season with Brazilian club Fluidness before moving to the UAE in 2014.