Robson persuaded the former England striker to join the Blades from Everton earlier this week, but insisted Beattie would have to fight for his place.
Robson told the club´s official website: "Every manager in the Championship would love to have James Beattie in their squad, and I am delighted to have him. He has to work hard and perform to get into the team, because nobody goes straight into my team, as everyone has an even chance."
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