The Arsenal boss revealed in his pre-match interview that Odegaard had earned the chance to make his first start with his performances in training.
“He’s had a really good path the last two weeks where he’s been playing some parts of games. He’s been training really good and deserves a chance to start,” Arteta said.
Hector Bellerin had made it 3-0 on the stroke of half-time, before Pascal Struijk rose above the Arsenal defence to plant a header firmly past Bernd Leno in the second-half.
Helder Costa then gave Leeds hope of a remarkable comeback with a strike 21 minutes from time, but the Gunners ultimately ran out comfortable winnners.
The victory means Arsenal now lie tenth in the Premier League, and are just five points from Chelsea, who are fifth.