Sports Desk : Full-back Luke Shaw suffered a double fracture of his right leg in Manchester United's 2-1 Champions League loss at PSV Eindhoven.
Shaw, 20, will have an operation on his return to Manchester, the club said.
He received oxygen while being treated on the pitch for 10 minutes after Hector Moreno's tackle.
"It is awful. It was a very bad tackle. He had the oxygen mask on and was crying in the dressing room," said manager Louis van Gaal.
The left-back has started all of United's eight games this season, as well as playing in England's European Championship qualifiers against San Marino and Switzerland.
Yet with just nine months to go until Euro 2016, Shaw has suffered a broken tibia and fibula.
When Arsenal midfielder Aaron Ramsey suffered a similar injury against Stoke in 2010, he was ruled out for nine months. The Welshman tweeted: "Fingers crossed for Luke Shaw. Get well soon."
Less than an hour after suffering the injury, Shaw wrote on Twitter: "Thank you everyone for your messages, words can't describe how gutted I am, my road to recovery starts now, I will come back stronger."
Former PSV player Memphis Depay scored the opener for the visitors in Eindhoven, before Moreno headed in an equaliser on the stroke of half-time.
Luciano Narsingh then nodded home in the second half to secure victory.