Rangers are still searching for a new manager following Pedro Caixinha's exit from Ibrox.
Celtic will be looking for a new right back in 2018, according to manager Brendan Rodgers.
Manchester City defender Pablo Mari could be on the move in 2018.
West Bromwich Albion are reportedly considering Rangers target Derek McInnes, amid links to the Ibrox club.
Celtic recently took Australian duo Nick Faust and Leo Mazis on trial.
Everton allegedly pursued Celtic's Moussa Dembele over the summer.
Ex-Rangers midfielder Ian McCall believes Derek McInnes is Ibrox-bound.
The Celtic boss did not get a fair crack at the Reading job when manager in 2009.
Rangers are being linked with a move to bring Michael O'Neill to Ibrox.
Tim Sherwood has admitted his interest in taking the Rangers job.
Sheffield Wednesday look set to host Pedro Caixinha's Rangers at Hillsborough later this month.
Rangers were knocked out of Europe by minnows Progres Niederkorn on Tuesday, almost a year since Celtic were humiliated on the continent.
Pedro Caixinha's new-look Rangers were knocked out of Europe by Progres Niederkorn on Tuesday.