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"His fitness in pre-season has been fantastic and we are getting the benefit of that.
"Ruud's last season was fragmented and it was partly our fault for bringing him back too early. But in his first two seasons in England he scored 36 and 44 goals and he is capable of doing that again.
"Ruud's season last season was fragmented, and it was partly our fault in bringing him back too early for the Milan [Champions' League] game. His fitness has been fantastic in pre-season and we are getting the benefit of that."