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We did not exactly learn this fact from Sunday's game but rather from the post-game press conference, via the team's website, at which, Wenger confirmed that his future is in north London.
"Yes. I don't know [when I will sign a new deal]. I told you many times that my word is my word. I am from a period where you did not need a pen to commit."
If Wenger left this summer, Arsenal would be in a state of utter chaos. Wenger is such an integral part of the club, and the board seems wholly invested in him as a member of both the brass and the day-to-day management of the squad.
Hopefully, they line up a replacement for him in a couple years' time, but it's also in the club's interest to keep him around for at least another season. This summer will be one of transition for Arsenal, and there is no man better to see the club through such a period than its manager of 18 years.