Avenatti named Suns rookie center Deandre Ayton and Oregon's Bol Bol as players who "received large sums from Nike."
Holiday, who last played March 6, was averaging a career-high 21.2 points, 7.7 assists and a career-high 5.0 rebounds per game this season.
Booker dropped 59 points in the loss to become the first player in NBA history with 50 in a game in which his team lost by 30 or more.
McCollum will miss four games against the Bulls, Hawks, Pistons and Timberwolves.
Jusuf Nurkic will not play again this season, with the Portland Trail Blazers setting no date for a return from compound leg fractures.
The Portland Trail Blazers' win over the Brooklyn Nets was overshadowed by Jusuf Nurkic's serious injury.
Nikola Vucevic torched the Philadelphia 76ers with a game-high 28 points and 11 rebounds in the contest.
Rudy Gobert made history against the Phoenix Suns on Monday.
Could Jason Kidd replace Luke Walton as head coach of the Los Angeles Lakers? The 2011 NBA champion responded to speculation.
New Orleans Pelicans owner Gayle Benson addressed rumours that the NBA team could leave the city.