ST JOHNSTONE boss Callum Davidson has pointed to refereeing consistency when asked about Celtic's winning goal at McDiarmid Park.
The Hoops left it late to score the winner in Perth as Ange Postecoglou's men found a way to take all three points home with them.
Giorgos Giakoumakis netted from an impressive Alexandro Bernabei cross in the final seconds of the game.
