Ronaldinho will miss FC Barcelona's Spanish league match against Almeria on Sunday because of a right foot injury.
Giovani Dos Santos will also miss the match because of a left ankle injury, Barcelona said.
The two players join a growing injury list at the Catalan club, which already includes Argentina's Lionel Messi (thigh), Portugal's Deco (calf), Ivory Coast's Yaya Toure (back) and Mexico's Rafael Marquez (foot).
Ronaldinho missed all of January with tendinitis in his left knee.
Leader Real Madrid, which plays at Deportivo La Coruna on Saturday, holds an eight-point advantage over Barcelona.