Manchester City boss Pep Guardiola says Ederson is fit for selection.
Ederson was left on the bench as Stefan Ortega played at Real Madrid in the midweek 3-3 Champions League semifinal first-leg draw.
Asked who was his No1, Guardiola insisted: "No, [Ederson] is the first choice.
"He was ready to play against Madrid and [will be] tomorrow, and the next game. We make the decision for many reasons."
On facing Luton tomorrow, he added: "We have to [focus], the Premier league so important.
"It's 11 months we've been fighting for the title, we know what position we are in."