The former Aston Villa youth is available on a free transfer after being released by Bristol City at the end of the season.
The 31-year old finished top scorer for the Ashton Gate side despite not being a first team regular, playing an important part in getting the team to the Play-Off final.
Byfield, who has also had successful spells with Milwall, Rotherham and Gillingham, netted 8 times last season.
