The Swede will be between the posts tonight in the first-leg of the Europa Conference League semifinal against Olympiakos. Emi Martinez will miss the game due to injury.
Emery said: "Robin Olsen has done really well every day in training, and when he has played, he has helped the team, so everyone believes in him and trusts his performances.
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"On Saturday he played 45 minutes against Chelsea, where he saved us.
"He is a humble man who hopefully can help us."