Simeone has two new goalkeepers to choose from, with Moya arriving from Getafe and Jan Oblak from Benfica this summer.
However, the gloves will belong to Moya for Tuesday's fixture at the Bernabeu.
"Tomorrow it'll be Moya. Oblak came in very recently. I'm not tied to anybody, just those who fit best what the team needs," Simeone told reporters at a press conference.
Atletico open their La Liga season against Rayo Vallecano next Monday.