Vieira admits he's been won over by the Swede.
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"I've seen him working hard out of possession, and he's always working hard for the team," the Frenchman told arsenal.com.
"I've seen him making the run to create that space, and for some reason, the ball didn't get there yet.
"But I think he's somebody who has more to give than what we've seen, and I like his energy, and I like his spirit when he's on the field.
"He's a real team player and scoring goals, he will score goals, I don't have any doubt about that."