West Ham manager Sam Allardyce must sell before he can bring any more players to Upton Park, Hammers co-owner David Gold has said.
But with Carroll injured, the Hammers -- who beat Cardiff 2-0 on the opening day of the Premier League season -- have only Modibo Maiga as a recognised and fit senior forward.
Gold said that although Allardyce was keen to augment his ranks, he would need to sell before he could buy.
"We have reached our target laid down by the new rules in terms of wages,” he told Sky Sports News. "The only possibility now is if players are sold. That's up to Sam, that's in his hands. If he releases wages, that will give us the opportunity to bring in replacements for those players.
"I think it's clear that we are still short of a striker. David Sullivan [Gold’s West Ham co-owner] agrees with that, Sam agrees with that, but until we release those wages by players leaving, there is little we can do."