Russia star Andrey Arshavin has admitted Arsenal's lack of height is a genuine concern after their Premier League title hopes suffered a major knock last weekend.
The Gunners slipped 11 points off the pace set by Chelsea after losing 3-0 to the Blues at the Emirates Stadium last Sunday.
The north London club were dumped out of the Carling Cup at the quarter-final stage by Manchester City in midweek and Arshavin has confirmed a long-held belief that the Gunners are too lightweight.
"The fact that we have lost against out direct rivals this season signifies that we are not very good," he said.
"We are not good on set-pieces because we don't have many tall players – every other team has an advantage over us in this area.
"They were much stronger than us when it came to physical power. Had we possessed a tall player then things would have been better for us.
"We had nobody capable of holding on to the ball. We played good football against all these top teams but that is not enough.
"What we can change, only Arsene Wenger knows. He has been at the club for 13 years and knows the problems better than anyone."