The Norwegian has revealed he was eager to bring the pair in last winter from Dundee United, rather than waiting for this summer because of the experience and quality that they have both shown in the Scottish game.
Moving forward, the Celtic boss also feels they are both going to be very important players in terms of Europe next season.
“They are young, hungry Scottish players who know the game here and know the league and we expected that they would fit in very well,” said Deila.
“It was vital for me that we brought them in early rather than wait until this summer. It is not just about what they do on the pitch but also how much they have brought off it too.”
“They have had a taste of European football by playing against Inter Milan in the Europa League and they will have an important part to play as we try to get into the group stage of the Uefa Champions League now.”
Both players have been given a taste of the pressure and expectation at Celtic and that should set them up well looking ahead to next season.
It removes any notion of a settling in period ahead of next year, which may have affected the way they might start the season had the clubs waited until this summer to compete the transfers.
Their knowledge of the Scottish game would have given them some understanding of the magnitude of playing for Celtic and their positive characters have allowed them to strike up an instant partnership with the club’s fans.
The challenge they both now face is working hard over the summer to put themselves into a position where they are first choice when the new season starts in July and they will both be good options for the manager across all competitions.