Arsenal versus Tottenham Hotspur is one of the biggest rivalries in the Premier League. Given the history between the two clubs, matches are always highly anticipated.
However, Brazilian defender Gabriel had no idea how intense the rivalry was when he first moved to the Emirates from Villarreal.
In fact, the Gunners centre-back was under the impression that Arsenal's biggest rivals were Chelsea until his teammates corrected him.
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In an interview on Arsenal's official YouTube channel, Gabriel admitted he did not know just how big the rivalry was between the two north London clubs.
He said: "People talk about it [the derby] a lot here and I was told about it when I first arrived.
"I always thought that the main rival was Chelsea, but my teammates told me that Tottenham is the main rival. That makes the derby a lot harder."
Gabriel is yet to experience the passion of a north London derby, but may get a chance to take it all in when Spurs travel to the Emirates on Sunday.
The 24-year-old may have to settle for a place on the substitutes bench, though, as Laurent Koscielny is expected to return to the starting line-up.
The France international was an unused substituted at the Allianz Arena as Arsenal were hammered 5-1 by Bayern Munich.
Wenger has since admitted that Koscielny could have played in Bavaria, but rested him ahead of the huge Premier League tie.
He is not 100 percent fit following a hip problem, but the Arsenal boss said he is hopeful of a return for the defender.
Who would you start in the centre of defence for the north London derby? Let us know by leaving a comment below