The Portugal international will captain United for the first time on Tuesday evening as Ole Gunnar Solskjaer’s side begin their Champions League campaign in the French capital.
Fernandes, who joined United in a £47 million deal in January, is well known for demanding high standards at Old Trafford.
And the midfielder took no prisoners during Monday’s training session as he vented his frustration towards United’s new signing Alex Telles.
The Brazilian left-back sold Fernandes short with a pass during a rondo and the midfielder made his feelings clear with his new teammate.
However, Alex Telles appeared to hit back at Fernandes’ complaints as he angrily waves his arm after he was rebuked by the midfielder.
Fernandes, meanwhile, admits he was surprised by Solskjaer’s to make him captain for the match against PSG in the absence of Harry Maguire, who misses out due to injury.
‘My reaction was funny because I wasn’t expecting to be the captain of course. I found out in the press conference and it was funny because I wasn’t expecting that but I’m really happy,’ the midfielder told United’s official website.
‘It’s an honour for me to be captain of such a big club and to be captain of the team.
‘I think everyone has his own way to be a leader and this [game] will be the same for me and the others.
‘It will just be that I will have the armband on my arm.’