ORCHARD PARK, NY- On the first day of off-season workouts on the field, the Bills were busy on the business side too.

The Buffalo Bills made official one-year contracts with their four exclusive-rights free agents.

Tight ends Nick O'Leary and Logan Thomas, cornerback Lafayette Pitts and defensive end Eddie Yarbrough all signed their offers.

Exclusive rights free agents are players whose contracts have expired with less than three years of experience. The team can keep the rights to players like that by extending a qualifying offer.

The Bills also signed two others to one year contracts. Wide receiver Jeremy Kerley and defensive tackle Tenny Palepoi add depth to the Bills roster.

Kerley spent last season with the New York Jets. Palepoi spent the last four seasons with the Chargers.

Wide receiver Zay Jones, who had some trouble off the field recently, was on the field with his teammates for the Bills first off season workout.