The French coach has also made it clear that his selection process will not be altered in the New Year as the club's needs will always be first priority rather than the players'.
Although Arsenal remain one of the favourites to win the Europa League, the presence of exiting Champions League teams Atletico Madrid, Borussia Dortmund, Napoli and RB Leipzig could damage their chances.
The Germany global sustained the "minor thigh problem" in the lead-up to Manchester United's second goal in just the 11th of the game last weekend.
Arsenal ended their Europa League group stage fixtures with a thumping 6-0 win over BATE Borisov.
"They have to make their decisions, I have to make mine". But these are discussions I have had with the players. No matter how many sit in the stands, you have to give them what they expect - and that's what we did.
The 28-year-old has played just ten matches in all competitions in 2017/18, with his only starts coming in weakened teams in the Europa League and Carabao Cup.
Giroud has started two of France's three matches so far this term, but Stephan is reported to have said that the 31-year-old must play more at club level to keep his global place, and that perhaps a loan move in January would be a solution.
"Manchester United was a hard defeat to take", Wenger added. Arsenal had a lot of swagger about their play and Giroud did very well to find Walcott with an excellent header which Walcott did his best to get into the net, only to be denied when Denis Sherbitski saved exceptionally with his feet.
"It is not ideal for your balance, the way you fall down, for a footballer it's not great", said the Frenchman. "In the squad, this season more than ever, I can not see a weakness in anyone's motivation and quality in training", the Frenchman explained.
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