Juve was crowned champion of Italy for a ninth successive season after beating Sampdoria 2-0 at the Allianz Stadium on July 26. Sarri's men clinched the Scudetto with two matches to spare, but benefitted greatly from the inconsistent form of its main title rivals Inter, Atalanta and Lazio, goal.com reported.
The Bianconeri only picked up two victories from their final eight matches, and finished the campaign with back-to-back defeats against Cagliari and Roma.
After wrapping up its domestic schedule with a 3-1 loss at home to the Giallarossi, Sarri admitted that his side's motivation levels had dwindled.
While looking ahead to a Champions League last-16 showdown against Lyon, the Italian boss said Juve knew the title was all but wrapped up after last month's win against Lazio.
"A little fear can do us good. After Lazio we felt the championship was won and we had a mental decline," Sarri told reporters.
The truth is that Juve has failed to reach the same heights as in previous years throughout the season, which is reflected in its final points tally.
Their latest haul of 83 is the lowest number it has amassed in the last decade, and Juve also conceded more goals than in any of its previous eight title successes – 43.
Juve has recorded its worst goal difference of that period (+33) along with the highest number of defeats (seven) and the smallest final points gap between the top two clubs.
To make matters even worse, the Turin-based outfit has dropped 21 points from a winning position, more than any other title-winning side in Serie A history, beating Roma's previous mark of 20 set in 1982-83.
Sarri also saw his team beaten in both the Italian Super Cup and Coppa Italia finals, but he could end up silencing many of his critics if he can deliver the Champions League later this month.
Juve has not won the competition since 1996 and faces an uphill battle to reach the quarterfinals this time around having been beaten 1-0 by Lyon in the first leg of their first knockout tie.
The Bianconeri will be rewarded with a last-eight clash against either Real Madrid or Manchester City if it can complete a comeback against the French outfit on Friday.