Barcelona were 1-0 up in the final game of Group D and they were heading to victory, but Mathieu put a rubber stamp on the victory with his own goal in stoppage time.
Messi threaded the ball through for Denis Suarez, who broke down the right hand side before crossing into the box, and Mathieu diverted the ball into his own net as he stretched to try and keep it out.
Check out the own goal for yourself below:
Mathieu helps his former side out to go up 2-0 #BarcaSporting pic.twitter.com/bzt4OmcP5N
— Jonah Takalua (@Destaquito2) December 5, 2017