Argentina took on Portugal last night in front of a packed Old Trafford, and two of the world's best players took to the pitch to show off their skills. 

While the headlines would have focused on Ronaldo's return to the stadium where he became a huge superstar and the fact that he'd be facing off against Lionel Messi, there was one moment of comedic relief, although we're sure Lucas Biglia wasn't laughing afterwards. 

During a passage of play when the ball was bouncing around the box, Ronaldo went to take a swing at it when he accidentally caught the Argentine, Biglia, in the nether regions, instantly flooring him. In fairness, he reacted quickly and did his best to help him get his breath back. 

From one angle it looks a bit like he might have caught him in the stomach rather than the groin, but we're not ruling anything out.