Sturaro left Juve on loan in January but has only just made is Grifone debut after spending over six months out of action with a heel bone injury.
And a fine debut it was, with the 26-year-old taking only two minutes to find the net after being introduced as Darko Lazovic's replacement on 70 minutes.
Veteran striker Goran Pandev then added a second less than ten minutes later to condemn the Bianconeri to their first defeat of the Serie A season.
Allegri, however, reserved his praise for Sturaro, telling
“He's a lovely guy and suffered so much, out of action for practically a year with that injury, so he deserves it.”
Juve were without the services of Cristiano Ronaldo on Sunday, with Allegri having opted to rest his star striker ahead of the end-of-season run-in, and the former AC Milan boss was hoping for a far better performance from the rest of his squad.
“I expected a different Juventus. We did not put in a good performance, we made some mistakes and then the first goal came out of nowhere.
“Once we seemed to be in control, that's when he conceded and the game changed. You can't play every game to the best of your abilities. I think, if anything, this defeat can do us good and wake us up.
“We thought that we'd already won the Scudetto, but that is not the case. We need another five wins and must now hope that Napoli
“It's impossible to win every game, I've said that since the start, so no need to make a drama out of it. We've played 28 games, won 24 and drawn three. That's not bad”