GRAPHIC: Footballer's kneecap disappears into his thigh

Michael Krohn-Dehli's kneecap just did something kneecaps are never meant to do.

During his side Sevilla's Europa League clash with Shakhtar Donetsk the midfielder's kneecap slid up and into his thigh.

The Dane was brought on in the 59th minute, but only lasted 11 minutes before he was forced off on a stretcher.

Watch the gruesome injury in the video player above.