Saha, who left United to join Everton in 2008, reckons Rooney has come on leaps and bounds since those days.
He said: "Rooney has improved so much since I was there with him. He is more mature, more calm, his positioning is better. His quality is better.
"He has always been able to do whatever he wants. It's just been about getting him to play in a certain way. He's an immense player."
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