Bradford City boss Phil Parkinson has confirmed the club have signed Kilmarnock defender Michael Nelson.
Parkinson told BBC Radio Leeds: "I've been concerned about our lack of experience at the back with the big games we have coming up.
"Michael knows the job, he's a leader and he'll be a good addition for us."
Kilmarnock also revealed that former Livingston striker Rory Boulding had left the club.
"Rory signed a three-year deal in the summer but has struggled to make an impact for the first team making only four appearances," said a statement on the club's official website.