Arsenal signed Bernd Leno from Bayer Leverkusen over the summer but it was Cech who got the start against Manchester City last weekend, and that looks set to continue this time round.
"I am very happy with his performance," Emery said
"I think he has experience, quality, capacity like a first goalkeeper with us - and also Bernd Leno.
"They are two important goalkeepers for us. Different qualities but for us, like we want to play, the two goalkeepers can play.
"Saturday the decision is easy, Petr Cech will continue to start the match, I believe in him. If he starts bad, I believe in him also."