West Ham crock Carroll must make US treatment decision today
The club's £15.5million record signing has a damaged heel, an injury more common in basketball, and it is likely he will go to America to see doctors familiar with curing such a problem.
"He's been to Holland and Belgium," he said.
"There is a risk with any injury and always a risk that it will reoccur and on the specialist's reports we have had since it is a small percentage that it would happen and he has been unfortunate that it has happened to him.
"The only concern you have about the injury now healing and repairing, which it will do quicker than the other one, is there is always that little bit more doubt in your mind then.
"They feel that bit of pain and the player will think it is going to go again and that is what we have got to overcome with Andy and bring his confidence back that he is going to be okay and, if that little bit of pain arises, it is all normal with that sort of injury at this stage and that he just needs to work his way through it."