The defender says they are determined to put in a title challenge this season.
Arsene Wenger’s side found themselves on the back foot for much of Sunday’s north London derby, with Spurs putting in a highly accomplished performance at the Emirates and leading through Harry Kane’s opening goal.
The Gunners fought back though and managed to get the equaliser, with substitute Kieran Gibbs managing to squeeze an effort past Hugo Lloris in the visitor’s goal.
And Mertesacker says their comeback shows that they have the requisite mental toughness as a team.
“How we came back shows that we have got a good mentality and level of character in the squad,” he told arsenal.com.
“That’s important for the Christmas period coming up. It’s really important that, even if we suffer sometimes, we can come back. We showed mental strength.”
The result was a disappointing one for the Gunners, give how results earlier in the day had gone very much in their favour.
With Manchester City drawing at Aston Villa, a win over Spurs could have seen Arsenal go two points clear at the top of the table, something that would have been a big boost at this stage of the season.
Instead, the two sides remain locked together at the summit and Mertesacker says it is an interesting position to be in, saying they had vowed to be better than last season at the beginning of this campaign.
“It’s an interesting position but we still have room for improvement,” he added.
“We want to be involved throughout the season, competing at the top until the last second. We promised ourselves to do better than last season, not to drop a lot of points too early.”