Juventus boss Massimiliano Allegri has denied Arturo Vidal was dropped as a result of his off-field behaviour but told the player he must improve his attitude.
Vidal, who is again being linked with a transfer to Manchester United, was reported to have been fined and dropped for last weekend's 3-2 victory over Roma as a result of a nightclub brawl.
Allegri has denied Vidal -- who came on as a late substitute -- was left out of the starting lineup because of that but has warned the Chile midfielder to think carefully about his actions.
He said in La Repubblica: "There is no rift with Vidal. He didn't play against Roma for technical reasons. He has played a lot of games and this match came in a period when he has played in fits and starts.
"He's had a knee problem and returned from the national team with flexor trouble."
He added in Tuttosport: "What happened off the pitch had nothing to do with it -- that's a matter for the club. Now, though, he must adopt a different attitude."
Chile boss Jorge Sampaoli confirmed that Vidal had again suffered pain in his knee after the 3-0 friendly victory over Peru on Friday.
"Arturo played a game of great intensity," he said. "He finished the match tired and the tendon in his knee was sore. We'll see how it evolves, but apparently it's not too serious."