Sport says Collado is trapped at Barca without being able to play for the first team or the B team.
He did not sign for Sheffield United on the final day of the summer window and now he's unregistered.
Bayer Leverkusen could end up being his next team. They want him in January and Collado wants to leave on loan or sold, as soon as he can. He's 22 and doesn't want his progression to stall.