Goals from Griffiths and Boyata went unanswered to ensure some pressure was relieved from the under fire Deila.
Celtic started brightly, with Leigh Griffiths forcing a save from the Staggies keeper and Mikael Lustig heading narrowly wide from a corner.
Mackay Steven followed up on the initial Celtic pressure after Johansen slid him through on goal, but Scott Fox more than matched the former United man’s drilled effort.
In spite of a decent start, Celtic looked susceptible to attack on the counter. Indeed, Nir Bitton’s missed interception enabled ex Celt Jackson Irvine to strike from distance, but his scuffed effort never troubled Gordon.
As the half wore on and the score remained 0-0, the frustration of the fans after recent results grew and appeared to affect the team, resulting in County being easily able to break up Celtic attacks, and spray the ball quickly. However, few chances befell the Staggies.
10 minutes before half time, Griffiths missed a glorious opportunity to put the Hoops in front. Johansen cut the County defence open with an inch perfect pass, leaving Griffiths to round the keeper. However, from point blank range and the goal gaping, the forward could only hit the post. Chants of Seboooo would have reverberated around the stadium had another agonising performance not been on the cards.
Fortunately for Griffiths, his blushes were saved on the stroke of half time as the Hoops took the lead. A Tierney cross was met by the head of Johansen, who nodded down to Griffiths before the hitman slotted the ball past Fox from 10 yards out.
After a scrappy start to the second half, Mackay Steven had a glorious chance to put light between the two sides. Another excellent through ball from Johansen set the winger through one on one, but his powerful shot flew narrowly over the bar
Within 5 minutes, however, the Tic doubled their lead through Boyata. Stuart Armstrong beat his man on the left and floated a lovely ball to the back stick for Boyata to prod home with a diving header.
It took Celtic another 10 minutes to fashion a meaningful chance, as the Danish Gok Wan and home debut bhoy Sviatchenko could only put a header from point blank range over the bar.
The game petered out without incident to ensure Celtic left paradise with the 3 points.
We’ll all agree the last few weeks and the season as a whole have been difficult to watch and, to be brutally honest, today was no different. In spite of the comfortable scoreline, the frustration and rightful impatience of the crowd was tangible the whole way through. On another day, the game could have went the way of the Staggies were it not for some poor defending on their behalf. In terms of the Celtic performance, it was predictably lethargic, slow and uninspiring. Yes, its 3 points on the board, but it certainly doesn’t inspire hope for Inverness next weekend.