On Tuesday night, they succumbed to a 2-1 defeat at Olympiacos which also ended hopes of seeding for the knockout stage
With qualification already secure ahead of the last Group B tie, Wenger elected to leave several first-team regulars behind as 20-year-old defender Jernade Meade made his European debut.
Although Czech midfielder Tomas Rosicky fired the English side ahead after 38 minutes, the Greeks fought back through a controversial effort by Giannis Maniatis and a well-taken strike from substitute Kostas Mitroglou to leave Wenger facing more questions about the direction of his team - who have now not won in the last four and plummeted down the Barclays Premier League table.
"Let's see [what happens in the draw], but for now it is important for us to focus on the [domestic] championship, forget about the Champions League a little bit and get ourselves back in decent form in the championship," said Wenger.
Arsenal, who were beaten 2-0 at the Emirates Stadium last weekend, host fifth-placed West Brom on Saturday.
Wenger challenged his team to produce a response.
He said: "It is a good opportunity for us to keep focused, to show strength and unity, that is what you want to do in the next game."