Arsenal have confirmed earlier reports that centre-back Thomas Vermaelen has undergone surgery and will be out of action for around a month.

However, the Gunners have denied stories that the Belgian international has received treatment on a damaged Achilles tendon.

"Vermaelen has undergone a minor procedure to remove an inflamed plantaris tendon from his left ankle," read a statement on the club's official website.

"This is the same treatment that he had on his right ankle in January this year and has nothing to do with his Achilles tendon.

"The action was taken after consultation with specialists who advised this was the best thing to do to prevent it becoming a persistent problem."

The 25-year-old missed eight months of last season through injury.