Byrd said Sunday he had a second opinion on his foot after dealing with plantar fasciitis.
The safety added he's been working "as much as my body can endure" to return to the field.
The fifth-year pro has been mum about his injury since signing his tender. Byrd had been looking for a contract that would make him the highest-paid safety in the NFL.
The nature of a plantar fasciitis injury puts his return to the field up in the air. A lingering injury is the last thing Byrd could have hoped for as he seeks to prove he's worth a big contract next season.