Striker Romelu Lukaku and defender Diogo Dalot both missed training on Tuesday ahead of Manchester United's crunch Champions League match against Juventus, but captain Antonio Valencia and Marouane Fellaini returned.
Former France worldwide Petit believes Manchester United boss Jose Mourinho is being let down by a group of players he has labelled as 'good for nothings, ' after their first-half performance against Bournemouth last weekend.
Manchester United boss Jose Mourinho last managed an away match at Juventus in December 2009, when he was Inter Milan manager - he lost 1-2 in a Serie A encounter.
However, Mourinho believes United need to focus on the battle for second place with their other two teams in the group as they look to avoid demotion to the Europa League or an exit from Europe altogether.
Ryan Giggs is backing Manchester United to improve their performance against Juventus on Wednesday night after a woeful display against the Italians at Old Trafford.
Sure, in continental competition the Bianconeri boast an unblemished defensive return, but Manchester United should be encouraged by Juve's recent displays.
Talking Points From Manchester United's Win Over Bournemouth
The 27-year-old is certainly the best player we have at United and was brilliant in our 2-1 win over Bournemouth on Saturday. Manchester United have pulled off yet another thrilling comeback in the Premier League this season.
The Serie A champions' 1-0 win at Old Trafford on October 23 is the last game Lukaku started. "It was a signing at the time that I never thought we really needed; I thought the position was covered in Anthony Martial and Marcus Rashford", the former midfielder told BBC Radio 5 Live.
And Fletcher, appearing on Sky Sports, said: "The first time I spent out with my illness I did a spell coaching the reserve team when it included (Paul) Pogba, (Jesse) Lingard, (Ravel) Morrison and we played him higher up the pitch in attacking areas", Fletcher said. We knew the second half was going to be a different game. To have a top player like him is always a positive and it was a great achievement by the club to have signed him.
"For me, Manchester City are the leading favourite because they have Guardiola as the coach", the No.7 said in an interview with German publication Kicker.
"We will wait for Monday".
"But it is fantastic to have this feeling that it doesn't matter the result, we know the game is not over". And I think he's good enough to start.