The France striker has started Arsenal’s last three matches from the substitutes bench with Danny Welbeck picked to lead the line.
But Welbeck has failed to score for the Gunners since March 4.
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After Giroud scored his ninth league goal of the season against West Ham last week, the 30-year-old is pushing for a place in Wenger’s XI this evening.
And the Arsenal boss has praised Giroud for channelling his frustrations into motivation.
Arsenal's Olivier Giroud scores against West Ham
Wenger told Arsenal.com: “It’s difficult to manage because the striking position is like the goalkeeper position: it demands a lot of confidence.
“When you have international players who cannot regularly contribute and play, it's difficult for them to deal with of course. But I must say they do extremely well and you have a lot of respect for people who come off the bench and give absolutely everything every time to score. Giroud has done that again against West Ham.
Arsenal's Olivier Giroud comes on as a substitute to replace Danny Welbeck
“He has been absolutely exceptional because [being effective from the bench] is a skill in itself. You have to analyse what's going on during the game and take advantage of your positioning. Positional play becomes very important.
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“Also, to transform your frustration into motivation is a skill. You always have two options. You either feel sorry for yourself or you show the manager that it's not right that you don't start the game.”