The Danish striker stepped into the starting line-up to replace Olivier Giroud and managed to score a late goal, prior to Theo Walcott's injury-time effort, as the Gunners netted twice in the final few minutes to beat Cardiff City 2-0 at the Emirates Stadium.
After the match, Wenger heaped praise on Bendtner who unfortunately suffered an ankle injury in the win over the Bluebirds.
"Nicklas is a player who has gone through some difficult periods, so I just want to give him great credit," said Wenger.
"I told him already today that he is back to the level I want him to be at, and if he continues to develop like that he will come back into the team.
"Unfortunately he got injured today. He was a bit unlucky, he said he landed on the foot of a Cardiff player and sprained his ankle. It looks like it is not a question of days, but weeks.
"I am very sad for us, but for him as well."
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