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"I would question Newcastle's lack of aggression in the transfer market," he said. "In the modern day, you have to be aggressive when you want to sign a player. When you identify a player and he's your man, then you have to get to him, get to his face, sit with him and tell him he's the best thing since sliced bread.

Manchester United and Newcastle target Benjamin Sesko trained away from the first-team at RB Leipzig on Wednesday.