The Swede arrived at Old Trafford during pre-season on a free transfer after his contract with Paris Saint Germain expired in June 2016.
Rooney had his worst season in a Man United shirt to date last year, failing to reach double figures in Premier League goals for the first time.
The 30-year-old, however, was notably excited about playing alongside Ibrahimovic, his new strike partner.
“I am [looking forward to playing alongside him],” he said.
“He’s been one of the best strikers in world football over the last 10 years. He’s always won trophies wherever he’s been. He’s a huge character.
“So I’m looking forward to getting back training with him and then hopefully forming a good partnership with him and being successful together.”
The presence of Ibrahimovic, who has scored goals for fun throughout his career, will undoubtedly help Rooney restore his goalscoring touch after a tumultuous campaign last year.
Louis van Gaal‘s cripplingly possession-orientated approach meant the Englishman didn’t receive quick, forward thinking balls from out wide or to his feet. Rather, the slow build-up imposed by van Gaal meant that when Rooney did receive the ball, he was immediately hounded by defenders who could easily maintain their defensive shape.
Under Mourinho, Rooney will find more space to exploit in a far more direct and dynamic system, with Ibrahimovic’s superb vision and ability to hold up the ball, he has one of the best strike partners in the world.