Spain, who drew their first game against Portugal 3-3 on June 15 and beat Iran 1-0 on Wednesday, will face Morocco in Kaliningrad on Monday.

"It is our obligation to win the game, to get three points, and if we can win the group, then all the better. It's going to be a tough match. And always when you play against teams that are eliminated, you don't know what they are going to do. We are not sure how they're going to play tomorrow. It could be a very big surprise. That's why we should trust in our skills, and it's the most important ahead of tomorrow's match," Hierro told journalists.

The 2018 FIFA World Cup kicked off on June 14 and will continue until July 15, with the matches being played in 11 cities across Russia.