The strange case of Martin Montoya: Why is he now not needed again?

The absence of Martin Montoya from the list of selected players against Villarreal has reopened the debate about the Barcelona full back. For the first half of the season he was almost completely out of Luis Enrique's plans, attracting attention from other teams.

Then he suddenly reappeared in the Barcelona XI, when he announced that he was planning to leave the club. He went from doing nothing to playing five games in the league and cup in a month.

However, now the window has shut, Montoya was not needed against Villarreal or Athletic Club in the league, and has not been called up for this cup game. Dani Alves is missing next weekend against Levante, which means he may be back, but why isn't he being given game time tonight?