Celtic are back in league action today as they take on Hamilton Academical at Celtic Park - a world away from Thursday's Europa League clash against Inter Milan.
That game looked like being a disaster when Inter raced into a 2-0 lead, but Celtic showed great belief to haul themselves back into the game, earning a 3-3 draw thanks to John Guidetti's last gasp equaliser.
On a memorable night at Celtic Park, Manchester City loanee Jason Denayer was arguably at fault for the opener, miskicking a clearance which led to Xherdan Shaqiri's goal.
The youngster is a virtual mainstay of the side alongside Virgil van Dijk in the heart of the Bhoys defence, and whilst both are youngsters, Deila is delighted with their progress, with these quotes published by the Daily Express.
"Van Dijk and Denayer need matches like Inter, that’s important," said Deila. "They’re both young, very talented, and there’s a lot of attention on them when they play these games. They have to deal with that. We also want to develop a leadership style. Virgil has stepped up in that way, he’s much better than he’s been, but he’s still young."
Denayer is just 19, whilst van Dijk is only 23 - leading Deila to admit that signing an experienced centre back could be an option.
"To have another experienced central defender would be good. But if I had to choose I would stick with those two I have and not bring anybody in because they have the future in front of them," he added.
The transfer window is closed, so Celtic would be limited to signing free agents now - and with a very scarce market for experienced centre backs, this may be something that Deila will have to address in the summer, when Denayer returns to Manchester City, whilst van Dijk is bound to attract interest from bigger clubs when the transfer window re-opens.