Arsenal take on Valencia on Thursday night in the second leg of their Europa League semi-final and will be cautiously optimistic over their chances of making the showpiece in Baku after their 3-1 win at the Emirates Stadium in the first leg.
Summer signing Leno, however, will have to make do with a place on the bench against the Liga outfit, with Emery having settled on Petr Cech as his preferred goalkeeper in European competition.