West Ham United co-owner David Sullivan believes a salary cap needs to be considered for the Premier League.

Sullivan, who along with David Gold bought 50% of West Ham last month for £52.5m, said the salaries were "bad for football" and hit out at the imbalance created by the spending power of the ­billionaire owners of Manchester City and Chelsea.

"Maybe the ultimate solution would be a salary cap," said Sullivan. "I've always been against it but I'm starting to swing towards it, as they have in American football. Other than that I just don't see an end to it - of wages out of all proportion to the turnover of the clubs. Somehow there should be some sort of control."