Gallinari left Wednesday's game with a shoulder injury but did play Friday against the Jazz.
Gallinari is second on the team this season with 16.2 points per game.
Forward Trevor Booker (6.6 points, 4.7 rebounds) will start in place of Favors.
Favors is second on the team with both 16.4 points and 8.3 rebounds per game this season.
Jefferson has been bothered by the knee for awhile, but has not missed anytime with the injury. Williams has also not missed any time due to the injury.
Allen, who is averaging 8.6 points and 4.4 rebounds in 63 games this season, left Friday's game with the injury and was not able to return.
Both Jefferson and Williams have not missed any time but have been battling knee pain this week.