The attacking midfielder said: "It was hard. There were too many changes, too quickly. Now, we are not trying to do training drills in games and work out what way Ronny wants us to play.
“We know how we wants us to play and what he expects of us. We are confident we can progress and get into the group stages of the competition.”
Deila certainly struggled to get his message across in the opening weeks of his career at Parkhead, and the Bhoys suffered in Europe because of it.
The Scottish giants couldn’t see themselves past Legia Warsaw and then Maribor in the Champions League, despite being given a helping hand, although the did start the league campaign well.
This should really come as no surprise, as any club generally struggles when hiring a new manager, due to the bedding in period needed for coach to understand the players and vice versa.
Deila especially has overseen some major changes at Celtic since his arrival, and the style of football he has the club playing would have taken a long time to work on.
It is no surprise they struggled, and it is no surprise that Commons believes Celtic will progress to the group stages next season, having now had an entire campaign to work under Deila and learn his methods.
There will be no need to endure a period of understanding and pre-season where results are poor and performances are laboured, and the Bhoys should really start the next campaign in the same incendiary form in which they ended this one.