Alcaraz is playing at the Japan Open in Tokyo this week, while Sinner will compete at the China Open in Beijing in his first appearance since the US Open.
World number one Sinner swept aside Musetti 6-1, 6-4, 6-2 in the first all-Italian men's quarter-final in Grand Slam history.
Defending champion Sinner needed just 81 minutes to administer a brutal 6-1, 6-1, 6-1 drubbing to reach the last eight.
Sinner has reached the final of all three Grand Slams this season.
Sinner accepted a three-month ban in February following an agreement with the World Anti-Doping Agency, which challenged an independent tribunal's decision to clear him of wrongdoing after two positive tests for the anabolic agent clostebol.
Sinner received a three-month ban agreed with the World Anti-Doping Agency (WADA) in February after "admitting "partial responsibility" for team mistakes.
World number one Sinner agreed to a three-month ban on Saturday, admitting "partial responsibility" for mistakes by his team which led to him twice testing positive for traces of clostebol in March last year.
World number one Sinner agreed to a three-month ban on Saturday, admitting "partial responsibility" for mistakes by his team which led to him twice testing positive for traces of clostebol in March last year.
