The Parkhead boss watched his side fail to find victory at home for the fifth match in succession, a dreadful run of form that’s also seen the Glasgow giants win just twice in 12 games.
Mohamed Elyounoussi came off the bench to save a point after Chris Kane had given visitors St Johnstone the lead with just over ten minutes remaining.
The result sees Celtic lose further ground to rivals Rangers in the title race. Steven Gerrard’s men defeated Ross County 4-0 earlier on Sunday afternoon. The combination of the two results now has the Ibrox side 13 points clear in the title race, though Celtic hold two games in hand.