Giovanni van Bronckhorst reckons keeper Allan McGregor was "unsighted" for the RB Leipzig goal which downed Rangers in Germany.
A sturdy Ibrox rearguard was finally beaten by a spectacular Angelino volley to give the Bundesliga side a slender Europa League semi-final advantage.
The full-back smashed home from the edge of the box but pictures showed Leipzig players in an offside position in front of McGregor as the ball fizzed through a ruck of bodies.
