Not for the first time this season, the Norwegian was the subject of heavy praise from his supporters.
So much for title challengers...
The Scottish champions swept the Dons aside and, after beating their nearest rivals 4-0, the rest of Celtic's league season appears largely ceremonial - barring a miraculous collapse.
The Bhoys are now six points clear of Aberdeen with one game in hand. Champions elect.
Jubilant fans on Twitter after the game, meanwhile, were keen to single Stefan Johansen out for praise. Celtic supporters have already lauded the Norwegian this term and he was many fans' choice for man of the match against Aberdeen.
Not only that, though, many are calling the 24-year-old Celtic's player of the season. Johansen admitted recently he wants to score and assist more for Deila's men - and he duly delivered against the Dons.
Now it simply looks a matter of whether Celtic can seal the deal in all three domestic competitions, with the likes of Johansen and more in sensational form. Deila certainly won't get carried away - but Bhoys fans have every right to celebrate as things stand.
Here's a selection of their reaction on Twitter to Johansen's performance v Aberdeen...
my MOTM - Johansen. Incredible vision and engine. Amazing he and Deila ended up together here and thank God they did. #celtic— Matt (@monbud) March 1, 2015
Stick on player of the season Stefan Johansen makes it 4-0 #Celtic— kate (@pastyface43) March 1, 2015
Stefan Johansen POTY— sam (@samskindle) March 1, 2015