The Ibrox defender successfully appealed against the offer of a two match suspension for an attack on Scott Brown that produced a yellow card from referee Kevin Clancy.
Television evidence suggested that it was a straightforward red card with Brown left on the deck as he prepared for a Celtic corner.
After Flanagan was offered the two match suspension the Ibrox club issued a furious statement to the Evening Times which included a reference to Jozo Simunovic.
Celtic resisted responding to that comment but after today’s successful appeal the club turned to The Sun to share their thoughts.
The Sun reports:
Ref Kevin Clancy booked Flanagan for elbowing the Celtic skipper during the first half of Gers’ Old Firm win.
But three former refs reviewed footage and all agreed the Ibrox defender should have been sent off by the whistler.
Flanagan faced a two-match ban but an independent panel cleared him at Hampden today – leaving the Hoops amazed.
A Celtic spokesperson said: “The whole matter is a huge embarrassment for Scottish football.”
Flanagan was the sixth opposition player to be punished retrospectively for incidents involving matches against Celtic and the first to have a successful appeal.
Following the March Glasgow derby Celtic accepted a fine of £7,500 for the conduct of their players in a match that resulted in three suspensions for Ibrox players and a one match touchline ban for Steven Gerrard.