"Vidal's omission against Roma was a technical choice. He'd played a lot of games and I had[Andrea] Pirlo. What happened off the pitch has nothing to do with it, that's a problem for the club," he told Tuttosport.
"Now, however, he must have a different attitude."
The 3-2 win over Rudi Garcia's men was Pirlo's first Serie A appearance of the season and Allegri is now hopeful he will regain full fitness while on international duty with Italy.
"As for Pirlo, I can say his call-up didn't surprise me," he said. "Andrea needs to play. He's only played one game and if he can play for the national team in this break I'll only be too happy."
Juventus have enjoyed a 100 per cent start to the new season under Allegri and the former AC Milan boss admits he did not expect such a flying first few weeks.
"I admit I didn't expect to start like this in the league - we won at San Siro against AC Milan and at home against Roma," he said.
"In the beginning, a bit of scepticism is normal, as a coach who won three league titles has gone. Conte represented more than a coach for Juventus, but in life, you need balance: players, coaches all go, but the club remains."
Juve's win over Roma has continued to make headlines during the past week after the controversial penalty incidents and red card during the game, but Allegri is adamant the introduction of slow-motion replays would not benefit the game.
"I'm opposed to using slow-motion replays. After five days, Juventus-Roma is still talked about in penalties and centimetres, there was little respect for the players," he added.
"But replays have not been able to show who was completely right and who was completely wrong. And, in the end, it wouldn't be a computer who decides it, but a human being, and then he'll be told he was wrong.
"In short, I don't think slow-motion would solve this problem."
Goal.com