Celtic are set for a busy end to the January window but may have to wait until the end of the season for a reunion with Arsenal left-back Kieran Tierney, TEAMtalk understands.

Tierney’s contract with Arsenal is set to expire at the end of the season and Celtic have already reached a pre-agreement to sign him on a free transfer in the summer.

Celtic step up early Kieran Tierney switch for UCL push