A patrol boat intercepted the boat carrying the drugs on Friday, some 220 kilometers off the Senegalese coast.
According to the statement, the patrol boat had to use verbal warnings and warning shots to stop the boat, which had released its cargo before the intervention. The 690 kilograms of cocaine has been recovered, the statement added.
On November 28 and December 16, the Senegalese army announced seizures at sea of almost three tons of cocaine on each operation.
More than 800 kilograms of cocaine were also seized in January from a vessel off Dakar by the Senegalese navy.
Long considered as a mere transit zone for drugs produced in Latin America on their way to Europe, West and Central Africa has also become a region of heavy consumption, according to the United Nations Office on Drugs and Crime (UNODC).