The defender was signed by Coventry City from Aston Villa in the summer but only those supporters who were at the friendly at Nuneaton Town have actually seen the Republic Of Ireland international in a City shirt.
O'Halloran aggrevated a back injury, the day after City drew at Nuneaton and has missed all the season so far but now he is back in training.
Speaking to the CT, City boss Aidy Boothroyd said: "Stephen trained this week.
"It's not ideal to bring him back in these conditions but he is working hard and the quality is there for everybody to see so we could have a new player for the New Year.