The hosts had beaten Frosinone, Empoli and above all city rivals Lazio and had been hoping to improve on their sixth place in Serie A ahead of Tuesday's home Champions League game with CSKA Moscow.
However, Allegri said at a news conference Friday that there is no reason to take Ronaldo out of the lineup and rest him for Saturday's clash with Genoa.
"Cristiano is very relaxed, working well and about his personal problems, they are nothing to do with me". He has helped the team and brought a big sense of responsibility, something that the team had before.
"He's scoring goals too, which is what he does best, in addition to the assists".
Ronaldo, despite the turmoil of explosive rape allegations that surfaced before the worldwide break, notched up his fifth goal for his new employers since his headline move from Real Madrid in the 18th minute, ironically helped by a mistake from Genoa's top-scoring Polish striker Krzysztof Piatek.
Ronaldo is the focus of a criminal investigation in Las Vegas, accused of rape, with police re-opening a case from 2009.
"(Serie A)'s not boring", he said.
"We played, from a certain point of view, with our heads in Manchester".
"They're games in which the Scudetto can be won and lost".
"Everybody is saying that Juve are going to win all their games from now until June 1".
'Genoa will be a hard game.
The result gives Napoli the chance to close to within four points of Juve at the top of the table and sees their 11-game winning run in all competitive competitions come to an end just three days before they face Manchester United in the Champions League.