Gezzar, who came fourth in the 3,000 metres steeplechase at the European championships, missed the London Olympics after being provisionally suspended following a failed test for erythropoietin (EPO) at the French championships in June.
The Court of Arbitration for Sport dismissed his appeal that there had been errors in the testing process.
He had already been suspended for two years in 2006 for testing positive for nandrolone and finasteride.
- Sports & Recreation
- Court of Arbitration for Sport