Spain's defeat by Croatia in Zagreb on Thursday (3-2) leaves Luis Enrique's side waiting to discover their Nations League fate. They have played all their games and lead Group A4 on six points.
Meanwhile England host Croatia at Wembley on Sunday in the final match and both sides have four points.
Spain need them to draw so they can win the group and go through to the final four next summer.
If England win then they progress and Croatia are relegated. Vice versa, should the Croats win. If it is a draw then Croatia would be relegated on goal difference.