The Manchester City star trained alone ahead of the fixture despite completing 90 minutes in his country’s 4-0 win over Macedonia in a World Cup qualifier on Saturday.
Boss Julen Lopetegui says they will make a decision on whether Silva will feature on the day of the game.
“We’re going to see tomorrow,” he said. “We’ve got another 24 hours and we’re going to see how everybody is.
“We have an idea roughly but we’ll see what the exact scenario is tomorrow, how we’re going to set up and who’s going to feature.
“The first people to know of any changes will be the players themselves, of course, and they’ll know when we announce the team tomorrow night.”