Real Madrid and Brazil playmaker Kaka, the 2007 World Player of the Year, will be out for about 15 days after injuring the left knee that was operated on following the 2010 World Cup.
Kaka, who made his first appearance of the season for the Spanish club in January, had a series of tests which revealed the extent of the knee problem, the team said on their website (www.realmadrid.com) on Tuesday.
The 28-year-old former AC Milan player will miss Saturday's La Liga match at home to Hercules as well as next week's Champions League last-16 second leg against Olympique Lyon, also at Real's Bernabeu stadium.
Higuain set to return
Meanwhile, striker Gonzalo Higuain has made a "dramatic" recovery from the injury he suffered in November and could be fit to play against Barcelona in the Spanish Cup final next month, a Spanish sports daily said on Tuesday.
The Argentine international had been expected to be out for the rest of season after undergoing surgery for a slipped disc at a hospital in Chicago on January 11.
Coach Jose Mourinho is delighted with the effort that Higuain has shown, the newspaper AS said.