Spain coach Luis Enrique has welcomed Barcelona wing-back Alejandro Balde to his World Cup squad.

His first words on Friday, however, addressed Valencia fullback José Luis Gayà, who has dropped out of the squad due to injury.

"It has been the worst day," he said. "I can only thank [Gaya], but life goes on..."

After spraining his ankle, Gaya left the squad on Friday even though he could have been back for the final group game potentially, with Luis Enrique preferring to have two left-backs going into Wednesday's opener against Costa Rica.

Barça teenager Balde takes his place and Luis Enrique was full of praise for the young defender.

"He is well known to everyone, he is a very young player, but his experience in the first division makes him interesting enough for him to help us," Lucho added.

"I am sure the group will welcome him and help him with everything -- a bit like you are all helping me."