The German international defender is pleased with the start the Gunners have made and he believes the newly tightened back-line has been a major factor in their opening few gamesPer Mertesacker has praised Arsenal's defenders following their strong start to the Premier League season.
The German international has made six appearances for Arsenal this season and with the Gunners conceding only five goals, the second fewest in the league and Mertesacker believes the defence has been the key.
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"We have not conceded a lot of goals during games this year; most have been from set pieces. We just need to keep concentrating on our defensive level."
Arsenal’s defence has been much maligned since the 'Invincibles' era of 2004, and under the watchful eye of new assistant manager Steve Bould, the back four are blossoming.
Mertesacker, however, believes that the club's strength in depth in defence has helped and that they can go from strength to strength.
"The manager told us before the start of the season that we have a lot of good centre-backs and is convinced we can make the team stronger and stronger because we have a lot of those good players in every position," he added.
"The manager said he would change sometimes and I think that's great for our development."