Agent: Ozil not to blame
"Criticism is normal if a player plays badly, but Mesut feels people are not focusing on his performance; they are using him as a scapegoat for the team after bad results," Dr Sogut said.
"It was as if everyone knew Arsenal would not make it through and we needed a scapegoat.
Arsenal's next fixture is a FA Cup fifth-round tie away at non-league Sutton on Monday night, when Gunners fans will be expecting a response from Wenger's beleaguered squad.
Koscielny told Arsenal TV: "You need to stay together, defend together with all 11 players and keep this.
Despite the second-half capitulation, Koscielny insists Arsenal will fight to overturn the chasm in the home leg, but they would have to become the first team in the history of the Champions League to come back from a four-goal deficit and advance.