The Daily Mail says the striker was accused of assaulting a photographer during the squad's Christmas party.
The £35million England star, on loan at Upton Park from Liverpool, has found himself in hot-water after the incident outside a nightclub in Dublin in the early hours of Sunday morning.
Nolan, who joined Carroll on a trip to Whipps Cross Hospital in Essex on Tuesday to hand out presents to sick children, said: "Someone is trying to fabricate a story and that is the disappointing thing. It is part and parcel of what we do and we understand that.
"We have had a fantastic weekend away and you think you have come back with no problems but someone has made something which was nothing as far as I was aware."