Former Manchester United midfielder Roy Keane has said that he knew Arsenal were "in trouble" when Kieran Gibbs took the captain's armband in the second half of Wednesday's Champions League clash with Bayern Munich.
Gibbs took the armband when Koscielny departed, and Keane has questioned the left-back's ability to "bring everyone together" in a hostile atmosphere such as the Allianz Arena.
"When I see Gibbs with the captain's armband on at the end of the game, you are in trouble. If he is your captain or your leader, if he is the guy who is going to bring everyone together, you are in huge trouble," Keane told ITV Sport.
Arsenal will welcome Bayern for the second leg at the Emirates on March 7.