Eto'o was again absent for the workout on Sunday at Cameroon's base in Vitoria and coach Volker Finke said the forward -- whose contract at Chelsea expires this summer -- was struggling with the same right knee injury he nursed throughout the build-up to the World Cup.
The player himself confirmed via Twitter later on Sunday that he is likely to the match.
The doctors confirm! I would probably not be able to play the match vs Croatia on Wed, june18th due to an injury on my knee causing me pain.
- Samuel Eto'o (@setoo9) June 15, 2014Cameroon lost 1-0 to Mexico in their opening Group A match and will next face Croatia, which fell to defeat in their first game to Brazil, on Wednesday.
This World Cup is likely to be the last for the 33-year-old Eto'o, Cameroon's leading all-time scorer. He is playing at his fourth World Cup.
Cameroon look to rebound after loss
Despite falling in their World Cup opener to Mexico, Cameroon are determined to win at any cost to avoid their sixth consecutive World Cup defeat.
Angry Croatia shift focus on Cameroon
Croatia's Danijel Pranjic believes his side have moved on from their 3-1 defeat to Brazil in the World Cup opener.