The Gunners' win at the Liberty Stadium keeps them firmly in the mix for a top-four finish as they backed up their victory over Bayern Munich in midweek.
The 2-0 success at the Allianz Arena was not enough to help Wenger's side reach the last eight of the Champions League, but he believes it marked a turning point in their efforts to qualify for next season's competition.
He said: "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.
"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."