Celtic's hopes of a treble in Ronny Deila's debut season have been ended after a surprise 3-2 loss to Inverness in the Scottish Cup semi-final.
The Bhoys have already clinched the Scottish League Cup trophy, and with the Scottish Premiership title a matter of games away from being Celtic's once again, the Scottish Cup was the biggest obstacle facing them as the season draws to a close.
Yet just a week after drawing against Inverness, they were beaten by Caley this time around in a dramatic affair at Hampden Park.
Virgil van Dijk gave Celtic the lead before Craig Gordon was sent off for upending Marley Watkins, with Greg Tansey converting the subsequent spot kick.
As the game went into extra time, Edward Ofere but Caley in front for the first time, only for John Guidetti to draw Celtic level again - before David Raven notched a late winner to take Inverness into the final of the Scottish Cup.
Celtic fans were obviously disappointed after the game, but many directed their frustrations at manager Deila for a substitution he made during the game.
After Gordon's sending off, Deila sacrificed winger James Forrest in order to bring on goalkeeper Lukasz Zaluska - a decision Celtic fans were not happy with.
Many believed that the young wide man was Celtic's brightest player, providing pace and direction out wide to trouble the Inverness defence, whilst also adding that it should have been Kris Commons heading off the pitch for Zaluska.
Here are some of the reactions from Celtic fans on Twitter after Deila's decision to substitute Forrest instead of Commons against Inverness...
Thought Forrest was playing well then Deila brought him off, for me Commons should of been off.— Chris (@BrooonyBrooony) April 19, 2015
like why did he take forrest off first? like why ronny why? tell me ronny why?— HP (@HannahPeyton94) April 19, 2015
We took Forrest off when it should have been Commons. Done nothing all day. Forrest was playing well for once! Honest mistakes though!— CELTICBOB (@CELTICBOB1967) April 19, 2015
Ronny's team selection and sub's must be questioned! Forrest best player for once and he takes him off.We probably played better with 10 men— CELTICBOB (@CELTICBOB1967) April 19, 2015
Taking Forrest off was a mistake though. And if I never see Tonev again I'll be happy.— Franky Bonfanti (@FrankyB88) April 19, 2015
Commons poor corner at fault for goal. He shoulda been brought off straight away not Forrest. Ronny to blame. Poor decision— kevin mc dowell (@DoireCelt) April 19, 2015
Wish commons got taken off instead of Forrest! Commons has struggled. Forrest was the most dangerous player on the park!— Shaun Grimes (@Grimes_11) April 19, 2015
Don't understand why Forrest was taken off. Always going to be space for ICT to exploit and Commons can't cover— Daniel Ward (@dward_grfc) April 19, 2015
Joke of a sub. Forrest has been our best player by far today.— PM (@Mackin83) April 19, 2015
Thought Ronny got it wrong taking Forrest off . How Commons stayed on as long as he did is beyond me.— KYT (@Aidensbhoy) April 19, 2015