Robin van Persie has backed Arsenal's move for Ajax defender Thomas Vermaelen.

The 23-year-old defender is thought to be discussing personal terms with the Gunners after a fee of 12million euros was agreed between the clubs.

"It's a good thing," Van Persie told De Telegraaf. "There's nothing wrong with the qualities of Vermaelen. He can play as left-back and central defender and we need this type of player.

"The guys that we now have on those positions are already somewhat older."

Van Persie admits he does not know a lot about Vermaelen but added: "But our head scout does and he doesn't do such a thing out of the blue.

"He needs to see a player 30 to 40 times before a decision is made."