Arsenal boss Arsene Wenger is delighted with the early season form of Per Mertesacker.

The Germany defender is showing why Wenger brought him to the club last year.

The Frenchman said: "Per is becoming a dominant force for our club.

"He is a recognised centre-back in this country and he has a leading role in our team.

"Yes, it took him a while to get to this point - but I can honestly see that he has improved in terms of his mobility, his technical ability and also his ­personality."