Roberto Martinez reckons Barkley will shine for England against top opposition.
Martinez said: “I think it will be a real test of how England use their squad in a different way, because you are playing against probably the best team in the world [Spain] in terms of possession.
“It is probably the type of challenge they need going into the Euros, because it is completely different to what they encountered in the qualifying group.
“What I always look at with Ross is what he can do offensively against these types of teams because these teams, when they lose the ball, have left space.
“You need pace and power to break into that space, and Ross gives you that.”