All three of Carroll's seasons at Upton Park have been heavily interrupted by fitness issues and he will play no further part in the current campaign due to a knee injury that requires surgery.
Carroll has already missed an estimated 14 months of action due to injuries in his time with the club.
A struggle to play regularly has affected the England international as he looks to rebuild a reputation damaged by a fruitless spell at Liverpool.
Allardyce said: "It's crippling mentally for Andy of course because it was such an innocuous situation when you saw it - he just ran into a defender.
"These things have been testing Andy for a number of years so we all feel for him and we all miss him and want him playing for us, because you saw what an impact he has made."
