"The toughest moment was after the surgery, when I was immobile for 15 days and my knees were so swollen. It was hell," he told Gazzetta dello Sport.
"I expect to be back in shape for February and my ambition this season is to win the Champions League. By beating Real Madrid at the Bernabeu, Juve proved they are on a par with the best in Europe. It is my dream."
Meanwhile, the Bianconeri are doing well enough without Trez, notching up seven consecutive victories and just three points off leaders Inter.
"I see Inter and Milan in pole position for the Scudetto, followed by Juventus and Lazio, then further back Fiorentina and Napoli. But don't forget Juve always frighten the opposition, whether we are in front or chasing.
"To win the title really would be a special moment after everything we've been through," he said of the Calciopoli scandal and their year in Serie B.
"It is a challenge that I, Alex Del Piero, Pavel Nedved, Gigi Buffon and Mauro Camoranesi launched when we accepted demotion. It was a wonderful madness."