With Celtic fans forced to watch on as their manager received threats that simply don't have a place in world football, before seeing their side fail to win the league after suffering defeats at places where they used to turn up and win handsomely, it seems safe to say that the pressure is well and truly on the Scottish club and manager Neil Lennon to prove that the imminent change of manager at Rangers will hand Celtic the chance once again to haul themselves back to the top of Scottish football, knocking Rangers off their perch and keeping them off it for a few years to come.