Sterling sourly departed Anfield in July after forcing through a move to the Etihad Stadium, and Rooney is confident that his international team-mate will not look back with any regrets.
According to the England captain, Sterling has appeared more settled and happier in training with the Three Lions over the past week – in what is positive news for the team with Euro 2016 just around the corner.
“You can see he’s settled. He’s happy, I’m sure,” as quoted by the Liverpool Echo.
“He’s got the move he wanted. He’s started the season excellently, settled in really well at City.
“When you are going through what he did, trying to leave Liverpool, it can be quite difficult. But he’s a lot more relaxed and settled, which is good for us.”
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Sterling became the most expensive English player in history after his £49m move, which was the highest transfer fee that City had ever paid before Kevin De Bruyne’s £55m switch just a few months later.
He put pen to paper on a five-year deal, and has started all four of their Premier League fixtures, scoring one goal in the victory over Watford.