Arsenal winger Bukayo Saka was injured at the start of the Champions League league-phase match against Bayern.
The 25-year-old England international fell to the ground holding his knee after making a pass. Saka left the field with the help of medical staff. Eberechi Eze replaced him in the 10th minute. Eze opened the scoring 15 minutes later.
The match is being played at the Allianz Arena in Munich. Arsenal were leading 1-0 after 30 minutes.