The Brazilian has netted twice this season, firing home against Olympiacos in September before adding a second in the thrilling 5-3 win over Chelsea at Stamford Bridge a month later.
"He does go for it and he was close to scoring with his right foot [against Wigan], especially in the first half," Wenger told the Official Arsenal Matchday Programme. "He had a great chance from Robin in the second half when he mis-kicked but it was a great chance.
"I like to have a battle because we had many injuries and now Gibbs is back. In the last game I still had a doubt that he was completely ready but it is still a battle there.
"In every game it is an interesting choice but that is part of being a big club as well. You want the fight."