Roberts, 32, could face his old club Wigan today and put himself back in the shop window after demanding a move to gain regular first-team football.
Boss Big Sam said: "The disappointing thing for Jason was nobody bid for him, which was surprising for a player of his capabilities.
"We didn't particularly love each other when he said he wanted to go and I said he could. It never happened. I thought it would be a done deal but it wasn't.
"When January comes round we will look at the situation. It depends what Jason does between now and then."