Its a weak comparison but Coutinho reminds me of a lad that use to with us every Tuesday & Sunday on the park, he was a far, far better footballer than everyone else and could go past anyone any time he wanted. It was effortless for him.
Coutinho once did that for us, he'd turn and skip past people for fun, indeed he was capable of making professional footballers look silly. He just needs to get that attitude back, he needs to be told you are better than any of you're opponents and its your right to play round them as if they're not there.
I'm not sure if its through rest or reassurance, but it needs to be drawn back in to his game.
A good performance tomorrow could do him the world of good.