Manuel Lanzini
Manuel Lanzini has reportedly caught Liverpool's eyeGetty

West Ham United have warned Liverpool they have an "unbreakable option" to sign Manuel Lanzini on a permanent basis. Lanzini, 22, joined the Hammers late in the summer transfer window on loan from United Arab Emirates side Al Jazira and has delivered an instant impact at Upton Park.

The diminutive midfielder has already contributed three goals since his arrival on these shores – including one against Liverpool in his first full start for the club – and two more assist for Slaven Bilic's side, form that has inevitably seen the player linked with moves elsewhere.

According to Bleacher Report, Liverpool are one of the sides to have shown an interest in trying to hijack West Ham's attempts to sign the player outright. But West Ham co-chairman David Sullivan has warned that any club looking to try and disrupt their arrangement will be wasting their time.

"I know there have been some reports in the media over the weekend surrounding the future of Manuel Lanzini," Sullivan said via West Ham's official website.

"We have an unbreakable option with both Lanzini and his club, so any other team's interest is irrelevant. 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."

West Ham have a total of four players on loan at the club this season. Carl Jenkinson and Alex Song rejoined the club from Arsenal and Barcelona respectively while Victor Moses moved across the capital from Chelsea on transfer deadline day. West Ham's other co-owner, David Gold, suggested in September the club are hopeful of making at least two of deals permanent at the end of the season.