Las Palmas defender Cala has spoken of working with Arsenal boss Unai Emery.

In a new biography on the Basque, extracts have been published by the Irish Independent.

Cala played for Emery at Sevilla and says: "Unai asked us how we saw the team, how we could improve it. If you disagreed with him, you could say so, because he never took any reprisals.

"It's been different with some managers I've known, they would drop you if you dared say anything they didn't like. It wasn't like that with Unai.

"He always asked us to argue, and that led to a debate: 'I don't think that would be a good solution for this, this and this. Why do you think it would be good?'

"You felt you were important because he took your view into account."