Despite exiting the Champions League at the hands of the German outfit, a 2-0 victory over the Swans on Saturday keeps the Gunners in the hunt for a place in the top four of the Premier League.
The Frenchman believes that the 2-0 win at the Allianz Arena in midweek helped the North Londoners rediscover their belief.
"I am a great admirer of the attitude of this team, and to win such a big game on Wednesday has transformed the belief of this team," Wenger told London 24.
"We have struggled to find that belief this season but we have seen here you cannot question the solidarity of the players.
"They are showing qualities we will need up to the last day of the season."
Arsenal face Reading on March 30.