Wenger has been handed a three-match touchline ban and a £40,000 fine following a misconduct charge from the Football Association over comments he made about the refereeing of the game against West Brom.
Maitland-Niles played at left-back on Wednesday in the 2-2 draw at Chelsea, and Wenger said the 20-year-old may play in his preferred midfield position at the City Ground.
"We played three big games in six days, twice away, a big game at home, and we have to keep our level of focus and urgency, because the third round is always very hard, especially when you play away from home against a Championship team".
The third round of the competition marks the introduction of England's top teams to the competition.
Caretaker boss Gary Brazil picked Ben Brereton as a central striker against Leeds, but Tyler Walker is another option for the Championship side. Speaking to reporters, the veteran Frenchman said, "I will rotate a little bit because we come out of a very high loaded period".
While Wenger will shuffle his pack, he is certain to be without Granit Xhaka due to a groin injury.
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Theo Walcott has hardly featured for the visitors this season in the Premier League although he remains a threat in the cup competitions for coach Arsène Wenger's men, with four goals in eight appearances.
I am concerned about Arsenal here.
The FA on Friday confirmed that the Gunners boss will be forced to sit in the stands for Sunday's FA Cup-tie at Nottingham Forest, the Carabao Cup semi-final first leg versus Chelsea on Wednesday and next weekend's Premier League game against Bournemouth.
"We had a normal training session today and the players have been bright and noisy, which is a good indication they're happy, so they got on with their work".
"Alexis Sanchez, Mesut Ozil, Jack Wilshere and Alexandre Lacazette won't play but the real concern is that defence".