Spain coach Luis de la Fuente is wary facing Scotland in their latest Euro qualifier.
La Roja go into the game on the back of a 3-0 win against Norway.
De la Fuente said: "It's an important and difficult match against a strong opponent, with many players who play in the Premier League.
"This says a lot about the level of this team.
"Spain favourites for qualification? There are no weak opponents, and it's not a cliché. Even more so at international level. The goal is to be first in the group. It won't be easy."