AC Milan could be without four injured defenders as they try to pick up the pieces from their Champions League humiliation against Manchester United when they host Chievo on Sunday.
Key centre-back Alessandro Nesta is undergoing tests on a knee problem, the club said, while Luca Antonini and Daniele Bonera are also likely to be missing and Oguchi Onyewu is some way from fitness after knee ligament damage.
Second-placed Milan, four behind leaders Inter, will also miss striker Alexandre Pato, who is still struggling with a thigh problem.
Fifth-placed Juventus, buoyed up by Thursday's 3-1 win over Fulham in the Europa League, have been further boosted by forward Vincenzo Iaquinta and winger Mauro Camoranesi returning from long spells on the sidelines.
Both came on as substitutes against Fulham and could be in line for starts in Sunday's home game with bottom side Siena.
Inter, who visit struggling Catania on Friday, have defender Walter Samuel suspended and will be without injured striker Mario Balotelli amid continued media speculation that he wants to leave the club.
Coach Jose Mourinho serves the final part of his three-game touchline ban and will return to the dugout for Tuesday's Champions League last-16 second leg at former club Chelsea.
Captain Francesco Totti is still troubled by a knee problem and is poised to miss third-placed AS Roma's game at lowly Livorno on Sunday.
Palermo, two points clear in the fourth Champions League qualifying spot, have an injury doubt over playmaker Javier Pastore for Sunday's trip to Udinese after the club website said he had missed full training.
Serie A matches this weekend will feature a red ball as part of an AIDS awareness campaign, the Italian league said in a statement.
