The Blues took the lead against the Ligue 1 side through Callum Hudson-Odoi in the first half, but looked to have tossed away two points when Serhou Guirassy equalised with five minutes to go.
However, Olivier Giroud proved to be the hero, scoring an injury time header to secure three points and Chelsea’s place in the knockout stages of the competition.
Giroud may have grabbed the headlines, but Mount was impressive in midfield as he continues his excellent run of form.
The England international set up Hudson-Odoi’s opener with a sublime pass, which warranted a tweet from Fabregas, which simply read: ‘Mason Mount Fantastic.’
Mount replied after the game, writing: ‘Thanks magician, been watching your assists.’
Mount has come in for some criticism from Chelsea and England fans alike this season, despite generally being in very good form.
Blues boss Frank Lampard has acknowledged the talk and has called for it to stop after another good performance from the 21-year-old.
‘I have a good relationship with Mason. Not as close as some people think and he knows that I’m there if he wants any guidance,’ Lampard told BT Sport.
‘With Mason there’s been talk and it’s got to go away. I’m lucky to know him well at Derby in his breakthrough season in the Championship and he’s been outstanding with the way he works off the ball.
‘I’m not going to undermine that and he has all the attributes to arrive high up the pitch and score more goals and make more assists.’
Mount was delighted to pick up an assist, especially as it was for his fellow Chelsea academy product, Hudson-Odoi.
‘I just won the ball back in the middle and saw Cal in the corner of my eye, I just thought to play him in behind and get him running,’ he said.
‘When he’s in behind and running, no one’s going to catch him and obviously a great finish from him.
‘Pleased for him to give me an assist and for him to score as well, it was a good goal.’