Leno is yet to feature for Arsenal since joining from Bayer Leverkusen in the off-season.

Petr Čech has played every minute in goal under new Arsenal coach Emery so far.

But former Chelsea star Čech has not been without his critics as he has struggled to adapt to Emery’s demands to play out from the back.

Leno is more adept with the ball at his feet and Emery has confirmed the 26-year-old will get his first outing as the Europa League campaign begins at the Emirates Stadium.

Asked if Leno would be in the team, Emery said: “Yes. He is going to play in the starting line-up.”

Several clubs, including Arsenal under Arsène Wenger, have used the Europa League and other cup competitions as a way to rotate their goalkeepers, but Emery insists Leno will not be limited to a fringe role if he does well.

“The first decision for me every match is the performance,” Emery said.

“Tomorrow we are going to play Leno, but each match we are going to look at each performance and each preparation to continue playing. But not to give him or Petr or (Emiliano) Martínez one competition to play.”

“They are going to start tomorrow to give him the minutes and the chances in this competition, but they are going to continue looking and testing every match.”