Bradley was expected to be out for upto a month after tweaking a hamstring, but is recovering faster than first thought.
Arnason is improving after an ankle injury picked up on International duty with Iceland, but may not be rushed back into action too soon.
Both players are rated as '50/50' by gaffer Steve Evans who will serve the second game of his stadium ban.
David Noble has been given a few days off to resolve some personal issues and will miss tomorrows game, but will train on Thursday.
Evans, who made several changes to his line up on Saturday after the thrashing at Port Vale, may utilise his squad again with Daniel Nardiello, Laurie Wilson and Johnny Mullins all hoping for recalls.