David Raya backed himself to be number one at Arsenal

JOUSTING FOR POSITION: David Raya made his Champions League debut as Arsenal thrashed PSV Pic: Nigel French/PA

David Raya insists he always backed himself to become Arsenal’s first-choice goalkeeper – but admits he does not know if he will start Sunday’s north London derby.

The Spain international joined the Gunners on loan from Brentford this summer in a switch which, in all likelihood, will be made permanent for £27million next year.