The Blues youngster, who has been superb in his opening five Premier League matches this term, was substituted by Frank Lampard after just 16 minutes of the clash at Stamford Bridge.
The Valencia midfielder caught Mount on the ankle with an X-rated tackle, and despite his best attempts to continue the England international could not carry on.
Mount was then replaced by Pedro.
You can watch a clip of the tackle below…
The footage shows the young playmaker’s ankle buckle under Coqeulin’s boot.
Coquelin escaped with just a booking despite the dangerous nature of his tackle.
The French midfielder was kown for his hard-hitting tackles during his 10 years at Arsenal between 2008-18.
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