The Swedish centre-back was substituted in the 78th minute for his Brentford against Southampton and four minutes later the accident occurred.
Fellow defender Ben me jumped onto a corner in his own penalty area and happened to hit the back of Pontus Jansson's head and the Swede started bleeding straight away.
He received treatment on the side of the pitch but was then able to jump in and complete the match, which his Brentford won 2-0. It was the Brentford captain's first appearance since December 30 and there have been a total of just eight games in the English top flight during the season.