It was barely an hour into the big meeting with Chelsea at Stamford Bridge when the incident occurred.
Center back Raphaël Varane would try to break Pierre-Emerick Aubameyang, but the step with his right leg was slightly wrong.
The Frenchman was lying on the grass in pain, and was forced to change.
He was able to walk off the pitch himself, but left the pitch in tears with his face hidden under the red match shirt.
Varane was comforted by his teammates when he was replaced by Swedish international Victor Lindelöf.
Then, at the end of the second half, Manchester United suffered another blow.
Scott McTominay pulled down striker Armando Broja in the penalty area and the referee pointed to the penalty spot.
And the Italian Jorginho made a leaping move before safely making it 1-0 to Chelsea.
Then it got dramatic in extra time.
Brass Casemiro nodded, Kepa in the Chelsea goal saved via the post and the ball moved along the goal line before the Spanish keeper grabbed it.
The umpire looked at his watch, and it indicated that the entire ball was over.
And equalized, where the goal-line technical images showed that it was a matter of millimeters in United's favor.
A draw between Manchester United and Chelsea, and the London club is unbeaten in the eight games that former Ostersund coach Graham Potter has coached for Chelsea.