Celtic were hit by the news that manager Neil Lennon would be leaving the club this summer, and despite ex-Celtic midfielder Roy Keane being linked with the job, they went with unknown Ronny Deila.
The 39-year-old Norwegian won the Norwegian Premier League title with Stromsgodset in 2013, and had a big reputation in Scandinavia before making the surprise move to Glasgow.
Deila's reign didn't get off to the best of starts after the Legia Warsaw fiasco in the Champions League, and even after being reinstated into the competition, they lost to Maribor.
League defeats to Inverness and Hamilton piled the pressure on Deila, but his side have now won six of the last seven games in all competitions.
The Bhoys are gathering momentum, spearheaded by striker John Guidetti's goals, and now midfielder Stefan Johansen says the upturn in form is because the players have a better understanding of Deila's methods.
"At the start of the season we had a new gaffer with new ideas, but now we are starting to see what he wants in the team. The players know what they have to do. So it's easier and we will get better and better", said Johansen.
Celtic have returned to the summit of the Scottish Premiership, and Johansen says this his aim is not only to win the league, but add more silverware too.
"We want to win the league and two cups. We are in first place and we are going to do everything to stay there." he added.
Johansen, 23, was a £2m arrival from Stromsgodset in January, meaning that whilst he did play under Deila in Norway, he was actually signed by his predecessor Lennon - and his knowledge of playing under Deila is important for this Celtic team.