
The Schalke defender left his club's training camp in Austria Monday before flying to Paris Tuesday in order to link up with the Brazil Olympic squad despite being refused permission to travel.
"We have written to the Brazilian Football Federation CBF and the IOC (International Olympic Committee) demanding that Rafinha be prevented from playing at the Olympics," said Schalke general manager Andreas Mueller.
"If the CBF doesn't comply with our wishes then we will take the case to CAS."
Werder Bremen will also be pondering their next moves as playmaker Diego departed to Paris as well on Tuesday after a meeting with club officials, saying "I am going to Beijing."
Rafinha, Diego and Bayern Munich's Breno have all been selected for Brazil's Beijing squad but Breno is the only one to have received permission from his club to travel to China.
The German Football Federation (DFB) confirmed Tuesday that it had forwarded a protest by Schalke to football's ruling body FIFA.
"The DFB supports the protest and shares the legal opinion of the professional club that there is no requirement to release the player as the Olympic football tournament is not part of FIFA's international match calendar and there has been no relevant decision by the FIFA Executive Committee that requires players of a particular age category to be released for the Olympic Games in Beijing," said the DFB in a statement.
DFB vice-president Dr Rainer Koch said it was "unacceptable" that a top club like Schalke 04 was "surprised by such a development" with just three weeks to go until the start of the Bundesliga season.
"The cooperation of football clubs in regard to fixtures and national team requirements can only function if legal certainty is achieved in good time and applicable rules are clearly communicated," he said.
Confusion over the issue of releasing players has reigned since IOC president Jacques Rogge told Deutsche Presse-Agentur dpa last week that "the law says that if a club doesn't release a player then the player will be suspended for the whole period of the Games."
A FIFA spokesman confirmed Rogge's statement on Friday but FIFA general secretary Jerome Valcke made clear Sunday in a telephone call to his counterpart in the DFB, Wolfgang Niersbach, that there was no obligation on clubs to release their players for the Olympics.
"There is no requirement to release players, regardless of whether they are older or younger than 23," said Niersbach in an interview with the Sport-Bild newspaper.
The Olympic tournament is an under-23 event with three older players allowed per team.
DPA