Scotland coach Craig Levein hailed the heroic team performance which almost resulted in a sensational European Championship qualifying victory over Spain.
The reigning world and European champions won 3-2 at Hampden Park on Tuesday evening but were given an almighty scare when the home side fought back from two goals down to level the match.
Steven Naismith's first international goal and Gerard Pique's own goal had given Scotland hope of a major scalp until substitute Fernando Llorente netted a 79th minute winner.
"It's very frustrating," said Levein."I was immensely proud of the players tonight.
"They were heroes every one of them – from the first minute to the last.
"I didn't think it was over and the reason I say that is I believe I've got a group of players that will work, work and work till they drop.
"I believe I've got players that have got good quality on the ball and have good team spirit and belief in themselves.
"To get one back, then I realised we had an opportunity to keep pressing forward, and I'm just sick that we didn't manage to take anything from the game."