Pressure mounts on Celtic after second Old Firm defeat in a week

Ryan Naderi's first-half strike was enough to claim a big win at Parkhead. 

Celtic manager Martin O'Neill and Rangers boss Derek McInnes. Pic: Andrew Milligan/PA Wire.

Rangers racked up a second win over Celtic in eight days as boos rung around an all-green Parkhead following a 1-0 defeat by the Light Blues.

Celtic’s 74-year-old boss Martin O’Neill went into the game under the spotlight after two successive losses, including a bruising 3-0 Premier Sports Cup clash with the Gers at Ibrox last Sunday.