Juve took a giant step towards an eighth successive Scudetto by moving 16 points clear thanks to Sunday's 2-1 win at Napoli.
Miralem Pjanic and Emre Can put Juve on track for a hard-fought victory in Naples, where both teams finished the top-of-the-table clash with 10 men.
Juve remain undefeated after 26 matches, with 23 wins and three draws, but head coach Allegri said the Scudetto is not decided.
"As long as the maths don't give us the title, we have to keep winning our games," Allegri told reporters.
"I think we need at least five victories to claim the Scudetto. We won our two matches against them [Napoli].
It was a dramatic encounter on Sunday after Napoli goalkeeper Alex Meret was sent off in the 25th minute as he tried to win the ball ahead of Cristiano Ronaldo.
Pjanic scored from the ensuing free-kick before Can headed home Juve's second prior to half-time, though Napoli were given hope when the former was sent off at the start of the second half for a second yellow card.
Jose Callejon's 61st-minute goal set up a thrilling finish but Lorenzo Insigne was unable to complete the comeback for Napoli after his penalty hit the post with six minutes remaining.
"[It was] was a crazy match with various incidents that made it pretty messy," Allegri added. "The two best teams in the league were facing each other.
"Napoli have great technical skills and made it really difficult for us."