Trossard joined Arsenal in a deal worth up to £26million from Brighton on Friday and the winger goes straight into the squad.
CLICK HERE TO FOLLOW ARSENAL VS MAN UNITED LIVE!
Arsenal filed the required paperwork before midday on Friday, meaning Trossard could make his debut against United.
“I’m really excited to get started,” Trossard said in his first interview with Arsenal.com ahead of the game.
“This is a big club and I’m ready to show the fans what I can do. “Everyone has seen how well we’re doing already and I’m here to help achieve their dreams – including myself.”
Arsenal name the same starting line-up that beat Tottenham 2-0 in the north London derby last weekend.
Confirmed Arsenal XI: Ramsdale, White, Saliba, Gabriel, Zinchenko, Partey, Xhaka, Odegaard, Saka, Martinelli, Nketiah
Subs: Turner, Tierney, Smith Rowe, Holding, Tomiyasu, Vieira, Lokonga, Marquinhos, Trossard
Sunday 4.30pm GMT, Sky Sports
Venue: Emirates Stadium
Referee: Anthony Taylor