Emery gave Saka his debut as Arsenal manager.
Ahead of their clash with the Gunners, the manager said: "Arsenal have always had good players in their academy, and Bukayo Saka is a really good example.
"He developed because he had really good coaches at the academy and because I helped him, and he is developing a lot under Mikel Arteta.
"He is a really good player and he is humble. I am very happy for him."