The France international led the line for the Premier League club in a 1-1 draw with Everton on Sunday, and almost snatched all three points when his fierce 25-yard half-volley cannoned off the crossbar in stoppage time.
However, the 27-year-old - who has seven goals in 14 Premier League starts this season - had to take a watching brief in Arsenal's previous fixture, which saw replacement Nicklas Bendtner score in a 2-0 triumph over Hull City.
Giroud believes the brief rest will help him stay fresh as Arsenal aims to challenge for major honors.
"It did feel strange [to be on the bench against Hull] and I was a bit frustrated because I really want to play every game," Giroud told Arsenal's matchday program. "The boss said he had reason to leave me on the bench because it is better to have a rest sometimes, but I am obviously just really happy that the team won the game.
"We need everyone playing well to achieve our objectives this season and it is a really good thing for Nicklas and for his confidence [to score]. When we manage to play our game, it is always very difficult for opponents because they have to defend deep and be compact."