The loans of Middlesbrough player Halliday and Blackpool forward Zoko expired after the League One loss at Yeovil on Saturday, but now both have signed on the dotted line until May.
Manager Phil Parkinson, who also revealed that Billy Clarke is back in training, said: “They have both signed today.
“Zoko has signed until the end of the season and Halliday on a short-term contract until the end of the season.
“We’re pleased with that. We wanted to get those two tied up and they are both available for the weekend.”