West Ham owner David Sullivan admits regrets buying injured Andy Carroll for £15 million from Liverpool Sullivan retains hope Carroll will prove his worth for the club, though, saying: "If you ask me the same question at the end of the season, I hope I will be able give you a different answer and say 'Yes, it was the right decision to sign Andy Carroll'. He is a fantastic player and on his day he is unplayable. We love him and that is why we signed him. He is desperate to come back; he is sweating blood in training. Sullivan acknowledged he was worried about the depths the Hammers have sunk to in Carroll's absence - Allardyce's team headed into Saturday's game against Sunderland outside the relegation zone only on goal difference. "I am deeply concerned," he said. Anybody who looks at where we are in the table and is not concerned are kidding themselves. However, he maintains confidence in Allardyce. "I really believe Sam is the man for the job," he said. If he wasn't our manager he is exactly the type of manager you would be bringing in to be the manager. Where do you get someone better than Sam to do the job that is now necessary? If you asked me what kind of season Sam has had up to now, I would say 'disappointing'. But let's judge him at the end of the season. I think the Newcastle manager would have been sacked by most fans after a month of the season but now he is flavour of the month.