Trezeguet left Juve in the summer after a decade in Turin.
He said: "As a friend of Juventus, I think that it would be wonderful to get back in the Champions League and focus on the Europa League this season.
"It would be a season worth 10 out of 10. The Scudetto is down to Inter and Milan. But let's get back to my Juve. It's wonderful to see Andrea Agnelli as President.
"I grew up under the legend of the Avvocato. When he came to the pitch we were all in awe. It was as if he had won 10 World Cups, 10 Champions Leagues and 10 Scudetti.
"Andrea must recreate the same magic with the youngsters."