Celtic's trip to St Johnstone after suffering severe bruising against St Mirren.The young defender was taken off the field on a stretcher after injuring an ankle on Wednesday night and left Paisley with his foot in a protective boot.Shane Duffy came on to replace the 21-year-old and the Brighton loanee could be drafted into the starting line-up.James Forrest continues to get up to speed after recovering from ankle surgery, while defender Christopher Jullien is out long-term with a knee