David Coldwell, head trainer for Tony Bellew, believes former two division world champion David Haye will "come in lighter" for their rematch scheduled to take place on December 17 at the O2 Arena in London.
When Haye moved up to the heavyweight division, he was a real explosive force and usually weighed in around 210-pounds.
But when he came back in 2016, after more than three and a half years out, and had a more bulked up body and weighed between 224 and 227-pounds for his recent fights.
Haye was 224.5-pounds for the bout with Bellew in March. He was sluggish, his movement was limited and his punches were off their mark.
Bellew, who was moving up from the cruiserweight division and previously fought at 175-pounds, was a huge underdog coming in and many expected him to get knocked out early.
The opposite happened.
Bellew held his own, and completely took over the fight after Haye suffered a severe Achilles injury at the midway point. Haye became a one-legged fighter and he was eventually stopped in the eleventh round.
"David knows he can't fight at the bigger weight, he's far too slow and sluggish. He bulked up partly for vanity but also for his shoulder - to protect that injury Coldwell told Sky Sports.
"In the first fight with Tony, his Achilles could not take the extra weight so he will have to strip himself down as to not put so much pressure on that part of the body. Even in his career, when he was heavier at heavyweight, he was that fraction slower. Haye was lightning quick as a cruiser, so the lighter he is the more dangerous he is. He knows that and will want to come in and blitz Tony."
"We expected David to be lean and fast in March. I'm sure this fight will be more explosive, they will both go toe to toe more frequently."