The Bhoys' goal-getter will be sad to see Deila go.
Griffiths is Scottish football's leading league goalscorer this season with 28, and has added a further nine in both the domestic cups and Europe.
That's almost double the 20 goals he managed throughout the entirety of 2014-15, a campaign which began for Griffiths in and out of the team.
And the 25-year-old has revealed that Deila - who on Wednesday announced his intention to step down when his contract expires this summer - along with his staff, is responsible for his transformation.
LG: "When I first signed for Celtic, if you’d put me in that lone striker role I probably wouldn’t have done as well as I have now."— Celtic Football Club (@celticfc) 21 April 2016
"When I first signed for Celtic, if you’d put me in that lone striker role I probably wouldn’t have done as well as I have now," Griffiths said, as quoted by the Bhoys' official Twitter account.
"That’s all down to the coaching staff."
"Since January of last year I’ve not really looked back. It just took that little bit of time to get some game time under my belt and show him (Deila) what I really could do."
"Our relationship has just grown stronger and stronger."
"He has put a lot of faith in me to be that lone striker at Celtic and I’ve repaid him time and time again with goals.
LG: "The only fitting way I can say thank you is to help the team deliver five in a row.”— Celtic Football Club (@celticfc) 21 April 2016
"The only fitting way I can say thank you is to help the team deliver five in a row."
Deila admitted last month that while he always expected Griffiths would surpass the 30-goal mark, the former Livingston striker had surprised him with his attitude and approach this season.
Before arriving at Parkhead in January 2014 when Neil Lennon was still in charge, Griffiths spent three-and-a-half disappointing campaigns on the books of Wolverhampton Wanderers but was able to rediscover his form on loan to Hibernian.