Goals from Kris Commons and James Forrest handed Celtic the trophy, and even though Forrest missed a late penalty, it was an afternoon of celebration for Bhyos fans.
Now looking to seal the Scottish Premiership title and the Scottish Cup, Deila could end his first season in charge with a historic treble.
Everything going well then, right? Well, one player wasn't quite caught up in the celebrations at the final whistle, with John Guidetti cutting a frustrated figure.
The Swede, currently on loan at Celtic from Manchester City, has scored just twice since the turn of the year, and the chance of him staying long-term look even slimmer tonight.
After a row with Forrest over who should take the penalty, Guidetti was clearly angry that he wasn't allowed to take it - especially given that Forrest missed.
At the final whistle, Guidetti trudged towards the tunnel rather than celebrate with his team mates before being dragged back out my compatriot and international colleague Mikael Lustig.
Fans took to Twitter after the game to slam Guidetti's actions, branding the 22-year-old 'petulant' and were generally fuming over his 'shocking' attitude.
With rumours of a move back to former club Feyenoord, many Celtic fans admitted that they have now had enough of Guidetti and don't even want him to stay when his loan deal expires this summer.
Here are some of the reactions from Celtic fans on Twitter after Guidetti's performance and post-match attitude...
John Guidetti looked liked he did not want to be there when we celebrating. He is def away at the end of the season— Michael Smith (@smithmichael87) March 15, 2015
Guidetti can jump on the first flight to Rotterdam as far as I'm concerned.— Kieran Caw (@Kieran_Celtic) March 15, 2015
Griffiths over Guidetti any day, no denying wee John can play ball but Griffiths is an absolute workhorse!— Paul (@paulbyrne85) March 15, 2015
Give me the griff over Guidetti. Every time. Yes I’ve says it. Honeymoon is over. Enjoy your next 6 clubs.— Sean Laverty (@SeanLav7) March 15, 2015
Doubt Guidetti will be at celtic next season. Straight up the tunnel when you've won a trophy? Great attitude— Conor Dempsey (@conordempseyy) March 15, 2015
I would terminate Guidetti loan today for walking off the pitch #NotBiggerThanTheClub— James Connolly (@MarkHiggins24) March 15, 2015
Guidetti as a professional is shocking, away back to the dressing room cause he never got a goal. Just shows why City put him out on loan— Fraser (@fraserrsmith) March 15, 2015
That's it guidetti should never play for us again he's a baby walking off the pitch— James Patrick (@martyonerous) March 15, 2015
Guidetti straight down the tunnel after the game in the pap. His attitude is shocking at times. No player is bigger than the club— Josh Adams (@Adams_191292) March 15, 2015