They still have some able players to call upon though. Then, they won 13 consecutive games and eventually won the Premier League. And Wenger is clearly prioritising that one, with a host of big names sitting out Wednesday's session.
However, Alexis Sanchez is likely to start the match, after training in the last three days following his appearance off the bench against Bournemouth.
In the midfield, Jack Wilshere may partner Mohamed Elneny. He's getting stronger and stronger every day, and that's what we want from him.
Asked if he can get back to his best, Wenger replied: "Yes, if he is injury-free he will come back".
FC Koln are yet to win a match in England, having previously played five times in the country (D2 L3) - overall W2 D4 L6. Sometimes it takes time while other clubs use money.
"For a striker it's always important to score, the statistics are very important, and I keep it in a part of my mind, but the most important thing for me is to win and after that the goals will come", he said.
Speaking ahead of Arsenal's Super Sunday clash against Premier League champions Chelsea, Bellerin believes their current form can be compared to their opponents' start last season and that the Gunners shouldn't be considered out of the title race.
A strong showing can go a long way in helping Giroud grab a positive result for the Gunners, it will also give Arsene Wenger some pleasant selection dilemma, and possibly a larger role to the player over the course of the season.
The game against Chelsea is one of the most vital for Arsenal over the course of a season, and three points would mark a huge coup for the club and Wenger, who is once again under pressure from the media and fans, despite signing a new deal in the summer.
"[The] Europa League is a very important competition for us".