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The 29-year-old Dane was hurt in a collision with Florent Malouda, who appeared to catch him accidentally in the back with an elbow as the pair challenged for a ball.
Alan Shearer: "He got a very, very nasty knock on his back and he was actually struggling to breathe.
"They had to put the breathing apparatus on when he got into the dressing room.
"Thankfully, he went off to hospital and they have now stabilised him and hopefully, he will be okay."