The former Leeds and Ipswich centre back has been training with the squad this week and a deal could be agreed in time for this weekends game with Swindon.
The 34 year-old has spent time at Doncaster after leaving Elland Road in the summer.
Meanwhile, boss Andy Scott is still keeping tabs on Falkirk winger Jack Compton and Notts County's Jon Harley, despite completing the signing of Scott Griffiths and securing the return of Sam Wood yesterday.