It was Gera's first piece of action since injuring his ankle for Fulham in May.
"Everyone worked hard but Arsenal rotated well in midfield and scored an early goal, which was bad for us.
"But our squad is definitely stronger than when I left in 2008.
"There are lots of good players here - not just in the starting line-up but on the bench as well.
"The club has moved forward but this season will be very difficult for us. It will also be crucial. We need to play well - but the club is definitely moving forward."