The England international has yet to play a single minute so far this season due to an ankle injury, missing the Hammers' flying start to the new campaign as a result.
Carroll is now eager to make up for lost time after suffering another setback in his career, aiming for a place in Europe with West Ham.
"It's unbelievable," he told the club's official website. "I've been out for so long that to be back training with the lads again is a fantastic feeling.
"It has been a difficult few months, being in a dark gym by myself training every day. We're playing fantastically. The gaffer has signed some great players and we're showing the quality we've got with the goals we're scoring.
"That's why we are where we are in the league, so for me to be a part of that - I cannot wait. I think we can push right on for Europe. I don't see why not - I think all the lads are positive about that and I know the gaffer is too."
Carroll, who made the move to Upton Park from Liverpool earlier this year, scored two goals in 16 appearances for the club last season.