West Ham co-owner David Sullivan admits he regrets the signing of Andy Carroll, and would not have sanctioned the transfer had the club known the forward would be injured for so long.

After impressing on loan at Upton Park last season, the 24-year-old completed a permanent switch from Liverpool in the summer for an undisclosed fee reported to be £15 million (€17.7m).

However, a heel injury has prevented the England forward from featuring since his big-money move, with Sam Allardyce's men struggling in his absence, and Sullivan says a club of the Hammers' stature cannot afford to be without such an expensive asset.

"Had we known he would be out for this long, we would not have signed him," Sullivan told the BBC.

"We are not a rich enough club to deal with that. You know any player can get injured, but we can't buy a player knowing he is going to be out for half the season.

"When we signed him we were assured by the medical staff that the very, very latest he would be back was September 1. That would have meant he would only miss two league games.