The 26-year-old scored twice in the Gunners' 3-3 draw with the Cottagers in the Premier League.
"Giroud had a very good game, he had presence and won the long balls," said Wenger.
"He is dangerous and starts to have belief in what he is doing. There were a lot of positives in his game today."
Arsenal are currently seventh in the league table with 16 points from 11 matches.