Jannik Sinner has insisted that he did not receive preferential treatment from anti-doping authorities as he prepares for his return to action at next week's Italian Open in Rome following a three-month ban which caused anger among a section of the men's tennis tour.

Italian Sinner heads into his home tournament, the last major event before Roland Garros kicks off this month, with some suspicion that the world No 1 was treated leniently after twice testing positive for traces of clostebol in March last year.