Stuart Armstrong has been at Celtic since January 2015.
Both Stuart Armstrong and Tom Rogic have been linked with moves away from Celtic in recent times. Could the club's interest in Lovro Majer be hinting at anything?
Both Stuart Armstrong and Leigh Griffiths have missed most of 2018 so far due to injuries, and their quality has been sorely missed around the Celtic squad.
If Scottish Premiership champions Celtic had to cash in on a midfielder, they should surely choose Stuart Armstrong over Tom Rogic.
Celtic face Rangers in just under a fortnight's time.
The 25-year-old has been out of action for Celtic for a number of weeks, recovering from a shock hernia operation.
Armstrong continues to be linked with a move away from Scottish Champions Celtic, but Christie's Aberdeen form suggests they have got a replacement.
Celtic would have to pay a big fee if they want to sign John McGinn from Scottish Premiership rivals Hibernian.
Stuart Armstrong is expected to return for Scottish Premiership champions Celtic ahead of the Europa League clash with Russian giants Zenit St Petersburg.
Brendan Rodgers has chopped and changed his Celtic starting XI week after week this season, albeit often due the club's injury woes.
Celtic confirmed their progression to the Europa League despite losing at home to Anderlecht. But who were their best performers? And their worst?
Moss has been appointed Huddersfield Town's new director of football after leaving Brendan Rodgers' Celtic.
West Bromwich Albion are the latest Premier League club to be linked with a move for the Celtic Park star.