Adam Montgomery could be allowed to leave Celtic once the club strengthens the left-back position, as they are seeking another player for that role. The defender, who has recovered from a knee injury that ended his loan at Livingston early last season, is keen to relaunch his career and play regular first-team football.

Adam Montgomery is likely to depart again because he appears to have failed O'Neill's pre-season tests.

Adam Montgomery still has a year left on his contract but is likely to be sold or otherwise transferred.

Montgomery's long-term future at Celtic now appears uncertain as the club approaches summer. The defender’s contract is due to expire next year, and with Celtic expected to undergo a major rebuild following the appointment of a new permanent manager, there is a growing perception that several fringe players could move on permanently. Montgomery may now be among the players facing a permanent departure as Celtic prepares for another rebuild.