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(Reuters) - Arsenal have not lost a Premier League match where Per Mertesacker and Laurent Koscielny have completed the full 90 minutes for more than two years - a statistic the German defender struggles to comprehend.
A 2-1 reverse to Manchester City on January 22, 2012 was the last time the league leaders lost with the pair at the back, a streak that now stands at 32 matches, including 23 wins.
Arsenal have conceded 21 goals in 24 league matches this season, second only to third-placed Chelsea, and they have let in one goal in their last 11 home games.
"It (the statistic) sounds not real for me," Mertesacker told the club's website (www.arsenal.com).
"When I first heard it, it sounded very weird. It's a good statistic but we have to build on that.
"I think we have shown a lot of people who criticized us a lot over the last two-and-a-half years that we know each other much better now and that we complement each other well, so it looks like that's a good partnership."
Mertesacker and France international Koscielny have both come in for criticism during their time at the London club, but in tandem they have become one of the league's most reliable center-back pairings.
Their form has meant club captain Thomas Vermaelen has struggled to force his way into the starting lineup.
Yet Mertesacker said rotation would be important with a tough run of fixtures approaching, including league matches against Liverpool, Manchester United, Tottenham Hotspur, Chelsea, Manchester City and Everton in the next two months.
"But I wouldn't say that's only us or the two of us. I think when I speak about our center backs I want to include always Thomas Vermaelen because he's our captain and he's always vital for everyone. He's aware of situations, he gives us a boost, he came back from a heavy injury.
"The boss will rotate in the next couple of months and it's really important that we are all in good fitness and all in a good shape so we can continue our good form and good partnerships with the three of us."
Goalkeeper Wojciech Szczesny, who fought back from being dropped by manager Arsene Wenger last season to establish himself as the undisputed number one at the Emirates Stadium, said consistency of selection was key to their strong performances this season.
"We've been together for much longer and we understand each other's game now," the Poland international said.
"Over the last couple of seasons we had less luck with injuries - I never played with the same back four for more than two or three games (in a row).
"Now we play with the same back four, sometimes we rotate the fullbacks but in general we stay with the same defense."
Reporting By Josh Reich; editing by Toby Davis