Sarri lifted his first trophy as Chelsea manager on Wednesday with a dominant 4-1 defeat of Arsenal in the Europa League final, capping a decent maiden season that also saw the Blues return to the Premier League top four.
But the Italian has met resistance from sections of the Stamford Bridge support, and his name has been linked more than once to the vacancy left at Juve by Massimiliano Allegri's decision to stand down.
Reina knows Sarri better than most, having played under the coach for several seasons at Napoli; and he believes that the appointment would be a shrewd one on the Turin club's part.
“It would have been frankly difficult to see that happening two years ago, but we’ll see," the former Liverpool goalkeeper explained to Sky Sport.
"Napoli fans certainly won’t want it to happen, but Juve know how good Sarri is and it is their decision. Sarri is a real football man, he lives and breathes football 24 hours a day.
“He might not have won trophies with us at Napoli, but I am still very proud of what we did together.”
He retains a soft spot for both Napoli and Liverpool, however, expressing his hopes that the latter triumph in Saturday's final against Tottenham.
“Liverpool are used to being in Finals and proved they deserve to be there again," he added.
"I hope they can win in a great game of football. Jurgen Klopp is really stubborn, he never gives in and neither do his teams.
“Tottenham are versatile, often changing system, whereas Liverpool won’t change their philosophy. The aim will be to take the initiative and not be passive.”