Arsenal's new signing was at fault for both goals as the Gunners slipped to a 2-0 defeat to West Ham in their season opener - but the manager insisted he would not apportion blame.
Arsene Wenger refused to blame Petr Cech for two errors that led to West Ham seeing off Arsenal in their opening Premier League clash of the season.
Cech was at fault for both goals as he missed a punch to allow Cheikh Kouyate to head into an empty net before Mauro Zarate beat him at his near post from long-range in the second half.