The Hammers have an "unbreakable option" to sign Manuel Lanzini on a permanent deal, says club co-owner David Sullivan.
Lanzini, who sealed a loan-move from UAE side Al Jazir in the summer, has had a good start to the campaign at Upton Park, and reports suggest he is a target for other sides in Europe.
However, Sullivan is convinced they can make the 22-year-old a West Ham player for good.
“We have an unbreakable option with both Lanzini and his club, so any other team's interest is irrelevant," he told West Ham's officials website.
“Manuel has been a fantastic signing for the club and we all hope he can maintain this superb run of form for the rest of the season.”
Lanzini has scored four goals in total for the east London side this season, including the one he scored against Liverpool at Anfield.