NOVAK DJOKOVIC admits it has been “strange” to have Andy Murray working as his coach but believes he will benefit from one of his greatest rivals taking a “fresh look” at his game.

The 24-time Grand Slam winner has also spoken of his frustration at being “kept in the dark” over Jannik Sinner’s doping case, accusing the game’s authorities of double standards and a lack of transparency.

Murray, who retired after this summer’s Olympics at the age of 37, made the shock decision to join Djokovic’s team in November and recently spent 10 days with the Serbian in preparation for the new season.