The Juve captain struck in victory over Inter Milan on the weekend.
"I think that, in the end, Del Piero will remain," Colantuono told RMC. "You'll see. I believe that the directors, despite what has been said in the past, will opt for this option.
"Del Piero is in good shape and Juventus will be battling on numerous fronts next season, including the Champions League.
"Del Piero will certainly remain at Juventus."