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Pep Guardiola's tutelage has been the key factor in Raheem Sterling's improvement for Manchester City, according to Wayne Rooney.
Derby County forward Rooney detailed the impact Guardiola has had on Sterling's game during an interview with Jonathan Northcroft of the Sunday Times (h/t Simon Bajkowski of the Manchester Evening News):
"Raheem's a player who played on instinct, a lot of ability, and you're only seeing the best of him now. He has worked on it himself but it’s because of Pep Guardiola.