West Ham United co-owner David Sullivan believes manager Gianfranco Zola could resign.

Sullivan says the board have not reached a conclusion regarding Zola's future, but believes the former Chelsea star has been considering his position at the club.

"No decision has been made," Sullivan told the Daily Telegraph.

"He did indicate he might resign at the end of the season, but he might well have changed his mind.

"In interviews he has not committed his future to the club beyond the end of the season."