Jorge Lorenzo has been denied the opportunity to contribute to the Court of Arbitration for Sport's review of Valentino Rossi's penalty for the MotoGP finale at Valencia.
Rossi took his case to the CAS after his appeal to motorcycling's governing body the FIM was rejected following his punishment for causing a collision with Marc Marquez at Sepang.
Lorenzo, who trails Yamaha team-mate Rossi by seven points heading to Valencia, said the penalty of Rossi being put to the back of the grid for the last race, but retaining his points for finishing third in Malaysia, was "unfair".
On Monday lawyers for Lorenzo filed a request for intervention in order to be able to participate in the review of Rossi's case, but the CAS rejected that request on Tuesday.
In a statement the CAS said: "The case will continue between Valentino Rossi and the FIM only.
"The decision on Mr Rossi's request to stay the execution of the FIM stewards' decision is still expected to be issued no later than [Friday] November 6 2015."