The youngster has broken into Celtic’s starting line-up of late, with Deila throwing in him to crucial matches in Europe and the Scottish Premiership.
The Norwegian boss is fully aware of the what the 18-year-old has to offer, though, with some crucial advice having been imparted to him on how he can further unlock his potential.
“He’s been amazing in training – he speaks to me personally and helps with every part of my game," Tierney said.
“He tells me to get up and down the park and we watch video analysis. It all helps to improve my game.
“The manager is great with me that way. He tells me just to stay calm. I just do what I have been learning in training.”
Tierney has impressed whenever he has been given a chance in Celtic’s starting line-up, and he is rapidly building a reputation as one of the most exciting talents to have emerged from the club's youth system in some time.
The full-back has played against the likes of Fenerbahce in the Europa League, and he also played in Celtic’s 3-1 win against Aberdeen at the weekend.
And in both games he looked perfectly at ease, despite the pressure being on him to perform.
Tierney has now played five times for the Bhoys this term, and he could increase that tally if he is selected to keep his place in Deila’s side against Molde in continental competition on Thursday evening.