Walker, speaking on his podcast, said: "To leave Manchester United, when you've been at Manchester United for so long, to make that jump, I'm so happy for him. I think even, Napoli, the fans are very intense, but for what he's done, the goal that sealed it in the last game..."
He added: "When you play with confidence you can do anything. If I showed you that picture one year ago, and said 'who's that', you would never go 'Scott McTominay'. So congratulations both to Scott and his family and everyone associated with him. I'm very happy for you."