I think stamina is a big issue for him due to size and the way he plays, and not one that's easy to fix without tactical changes.
Against United he had 7 dribbles in the first half, 1 in second. Against Spurs, 6 dribbles in the first half, 3 in the second. Against Leicester, 8 dribbles first half, 3 in the second.
If you can deal with him for 45 minutes of football, he's pretty much neutralised, as if he's not running with the ball anymore he basically has no impact on the game whatsoever. I think he'd be much better suited going back to being an impact player off the bench.