The Gunners striker scored in a 3-1 victory over West Ham United on Tuesday night, ending a three-game goalless run.
He has scored 20 goals that is a great record and he is working very hard for the team
Giroud has been on the receiving end of criticism this season despite scoring 13 goals in 32 Premier League appearances.
And Wenger believes Giroud’s strike against the Hammers will give him belief heading into the final four games of the season.
“The quality of the goal gives him, I think, confidence again, gives him credibility again for people who questioned his ability, so that is important,” Wenger said.
“He is a strong lad, strong mentality, strong positive guy. He has a great mentality that’s what I think got him back.
“He has scored 20 goals that is a great record and he is working very hard for the team.”
Giroud has scored 37 goals in 91 appearances in all competitions since moving to the north London side from Montpellier in 2012.
MORE: Man United latest news
MORE: Arsenal latest news
MORE: Chelsea latest news
MORE: Liverpool latest news