The 20-year-old Spaniard scored 22 goals for the reserves last campaign but failed to make an appearance for the senior side.
"Maybe last year club thought that they don't need to have more youth players and Mourinho thought he needed to sign players from outside the club," Rodriguez told AS.
"I think maybe I deserved more opportunities. Anyway, this was what Mourinho thought and he isn't here now, so let's what will happen in the future and what the new coach thinks."
Current Paris Saint-Germain manager Carlo Ancelotti has been tipped to take over at Madrid this summer.