The midfielder has seen his chances limited at Queens Park Rangers, but has since moved to St Johnstone on loan.
Brendan Rodgers’s Celtic are reportedly interested in Sunderland’s Josh Maja.
Celtic's Kieran Tierney is arguably the most exciting Scottish talent in years and Tottenham Hotspur should make their move.
Neil Lennon managed Celtic between 2011 and 2014.
Rangers interim boss Graeme Murty is in the running for the Ibrox job.
Ally McCoist managed Rangers between 2011 and 2014.
Celtic signed Odsonne Edouard on a season-long loan.
Kristoffer Ajer joined Celtic as a 16-year-old, and is now an established member of the first-team squad.
Alfredo Morelos has been a huge success at Rangers.
Rangers host Celtic in the Old Firm derby this weekend.