The Bhoys bowed out of the Europa League after a predictable 2-1 defeat to the Dutch side, one that seemed to sum up their European campaign.
Celtic did produce a much-improved performance, however, although Griffiths was - for once - found wanting.
But Deila didn't criticise the 25-year-old forward and simply reaffirmed what he has previously done for the Hoops.
RD on Griffiths: Griffiths has scored a lot of goals and we got chances. He’ll score more goals in the future.— Celtic Football Club (@celticfc) November 26, 2015
Griffiths himself was a little more emotional. He took to Twitter to suggest he was 'SHOCKING' and was extremely apologetic to Celtic supporters.
I can't be more apologetic than I am right now. My performance was Simply SHOCKING and ultimately its cost us dearly.— leigh griffiths (@Leighgriff09) November 26, 2015
So is Deila right to back his players and hold firm, promising Celtic fans that his side will do better next time around?
Or is the Norwegian simply a passive coach who is out of ideas and therefore sits on the fence in his post-match press conferences?
Opinion will no doubt still be split on the Celtic boss, although it will have swayed towards the negative side once again after this defeat.
Where next for Celtic - will domestic success be enough for Deila, providing his team actually achieve it?