Sources close to the club has indicated that arsenal has completed the signing of young German defender Mats Hummels.The 21 year old is was widely regarded as one of the best defenders in the Bundesliga last season.

Mats hummels would make an excellent addition to Arsenal's squad.
Having spent a season on loan at Borrussia Dortmund, the club was so impressed decided to sign him permanently. Leaving Bayern Munich’s assistant coach Hermann Gerland to lament that FC Hollywood made a mistake in letting go of the promising defender.
“I’ve always known that Mats had the potential to become a class defender. We should never have let him go on a permanent basis,”
According to those who follow the German league, this may be just the man Arsenal needs to shore up the defence. The timing of his tackles is impeccable. He has also shown an excellent ability to read the game for one so young and at 6 foot 3 inches he has proved a useful weapon at defending and attacking set-pieces, with 5 goals to his name.
OK so I’ve totally made that up, but most of what you read in the papers are made up and this is much more believable.
Instead of all the hullabullo about Mark Schwarzer, the real need is at centre back. Wenger has on been harping on about it for months. Yet all we keep hearing about is a damn goalkeeper.
We could buy the best goalkeeper in the world, but that won’t help us much if we allow as many 1 on 1 situations as we did last season. We’ve lost Gallas, Campbell, Silvestre and Senderos —yes I know that the last 2 aren’t really losses but you know what I mean— and the only replacement we’ve brought in is Koscielny.
There is a clear and present need to get another body in that position, at the moment we only have 3 recognized centre backs and with Djourou injured (again) that leaves us to open the season with Håvard Nordtveit as backup. As far as I can tell Nordtveit only played at right-back during the pre-season, which shows that Wenger does not regard him as a centre back.
We all know that Arsène is stubborn, but to not buy another centre back could be viewed as negligence and dereliction of duty.
So for all those who say that they are worried about the goalkeeping situation, I fear that those misgivings are entirely misplaced. What the gooner nation should really be worried about is the centre back position.
Forget about the goalkeepers, because anyone who looks at last season objectively will realise that the defence has put the goalkeepers in terribly compromising situations much too often. Van der Saar, and Cech hardly had has many saves to make as our keepers.
Once we sort out the defenders, then we can think about winning the title. Otherwise I’m afraid that we’ll have to forget about defence and just make sure we score more than the opposition.
steww
13 Aug 10 at 1227hr
But let’s not forget we’re a way off the end of the window and have no way of knowing if another defender is on his way. For real I mean…
dfunkydog
13 Aug 10 at 1411hr
I’m sure we will sign a new CB before the end of the window, not doing so will be madness.
I just don’t understand why their is more clamour for a new goalkeeper.