It's one of those injuries that neither football fans nor players ever want to see on a football pitch.
Manchester United left-back Luke Shaw, 20, suffered a horrific injury when his team played Dutch side PSV Eindhoven at the Philips Stadion on Tuesday night. United lost the game 2-1, but the game was marred by Shaw's injury.
The English youngster displayed his brilliant pace just 14 minutes into the match, before a strong sliding challenge by Mexican defender Hector Moreno inside the PSV box did all the damage. Shaw received oxygen while being treated on the pitch for more than eight minutes after the horrific tackle that caused a double fracture of his right leg.
Now, Manchester United have confirmed that the player will undergo an operation, and Shaw also tweeted that he will "come back stronger".
United manager Louis van Gaal has stated that the tackle from Moreno was "awful" and worthy of a red card.
"It is awful. It was a very bad tackle. He had the oxygen mask on and was crying in the dressing room," Van Gaal said.
"A boy who came to Manchester United at 18 years old, it was very difficult, and the next season he plays fantastic and then that happens like this.
"When I say it is a red card and penalty, you will say I am a bad loser. Every word I say is taken in the wrong way. It was in the 18-yard box and it was very bad tackle with two legs.
"I'm not a doctor so I cannot say, but when you have a double fracture it is four to six months. But you can never say that in advance.
"He won't play in the group stage, I don't think. I hope he will play again this season," the Dutchman added.
PSV defender Moreno has also wished a speedy recovery to Shaw.
Meanwhile, Shaw's teammates, as well as former and present football players sent all their best wishes to the player for a speedy recovery.