Merriman said Friday he didn't think the injury was significant. The Bills will have their bye next week, giving him an additional week to heal.
The seven-year veteran has a history of problems with his right tendon, but the team has not indicated which Achilles' Merriman injured this time. He aggravated the injury during his first practice with the Bills in November of last season after the team claimed him off waivers from the San Diego Chargers.
Merriman finished last season on injured reserve.
The Associated Press contributed to this report.