From what I've seen/read about Selles since his appointment, he seems to favour closing down teams quickly to win the ball back or enforce errors under pressure. On the flip side he then either wants the team to play quick passes to get around teams closing them down in the same manner, or hold onto the ball and drive forward with it if no one is closing them down (Hallelujah, I've been asking for this for years. No more static subbuteo football.
I'll be interested how Campbell will cope with this. If he could only manage 60-65 minutes under Wilder playing his style of football, there's no way he'll last the same playing Selles' way. On the other hand O'Hare should thrive in this system as this is exactly how he likes to play.
Track back and tackle

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Quick passes under pressure

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Keep the ball and dribble with it

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