Celtic suffered a defeat to Rangers in the Scottish Cup, losing on penalties to their bitter rivals.
The loss was a tough one to take up against a resurgent Gers, who had not tasted success against Celtic since their relegation in 2012, enforced by financial irregularities.
One former Celtic player, Artur Boruc, was not pleased, sending a sharp message displaying his feelings.
Boruc played for Celtic between 2005 and 2010, and became a real villain for Rangers fans.
His gestures, as pictured above, landed him in trouble with authorities and warned as to his conduct, urged not to incite the crowd during emotionally charged Old Firm encounters.
Boruc, 36, currently plays for English Premier League side Bournemouth, yet still has an affinity for his former side, who will hope to exact their revenge on Rangers next season.