Harry Maguire clashed with Cristiano Ronaldo in Manchester United's loss to Atletico Madrid as he accidentally headbutted his teammate.
The pair were looking to find an equaliser that could've forced extra-time at Old Trafford. Their attempts failed as Atletico Madrid ran out 1-0 winners in the north west and Ronaldo was forced to take a hit for his efforts as United prepared for a set piece in the 66th minute.
Maguire and Ronaldo lined up in close proximity and, as the centre-half attempted to move and evade his marker, was unaware that his teammate was so close and struck him in the face with the back of his head. It left Ronaldo in pain as he hit the ground.