Bayern Munich defender Sacha Boey has apologized for a violent head collision with Augsburg's Robin Fellhauer during the Bavarians' 3-2 Bundesliga victory on Saturday, reported dpa. "Sorry again for what happened and get well soon," Boey said on Instagram. Boey and Fellhauer collided violently in stoppage time in an air dispute for the ball. The Augsburg player had to receive treatment on the pitch for several minutes and was eventually carried off on a stretcher. Boey received a yellow card. Augsburg coach Sandro Wagner said that according to an initial assessment, Fellhauer suffered a concussion and will be out for several weeks. Wagner sharply criticized Boey for the incident. "The only thing I would have wished for was that he hadn't walked away so coolly but had apologized immediately, rather than waiting until he saw that the young man couldn't move," he said. Bayern coach Vincent Kompany, meanwhile, defended his player: "Maybe he couldn't really understand the situation at first." Kompany also wished Fellhauer a good recovery.