Arsene Wenger says he is "concerned" about his side’s poor conversion rate from set-pieces.

Arsenal had 15 corners during Saturday’s clash with Tottenham but failed to make any of them count.

The Gunners have yet to score from a corner this season and Wenger admits it is an area that needs to be improved.

"If you have 15 corners against you, you will concede because they should be so difficult to defend" Arsene Wenger

“It’s a concern,” the manager said. “We have lots of room for improvement and we need to do that quickly.

“If you go anywhere in the world and have 15 corners against you, you will concede because they should be so difficult to defend.

“I have a lot of talent at my disposal but Tottenham are a very tall side. Players like Jan Vertongen and Younes Kaboul are very tall and they defended well.”