Former Celtic forward John Hartson questioned Ange Postecoglou's team selection and setup in the wake of the Parkhead side's 3-1 defeat to Bodo/Glimt.
Hartson's old side have it all to do in the second leg of the Europa Conference League tie as they go to the Arctic Circle trailing by two goals.
Runar Espejord's sixth minute opener on his debut set the tone as the brilliant Norwegians showed no signs of rustiness two months out from their last competitive game.
