WATCH: “17, what the f**k?”: Mats Hummels reacts to hearing opponent’s age

Last night Mats Hummels was stunned to hear that an opposition winger who caused him endless problems on the field was a mere 17-years-old.

The defender was playing away with Borussia Dortmund in the Europa League last night, and the Germans had an unexpectedly difficult night against Norwegian side Odds BK.