The Celtic boss has been discussing the 25-year-old forward's role within the Bhoys' squad.
The 25-year-old, signed by Celtic for £2.7 million, currently finds himself somewhat out of favour at Parkhead, with a number of different forward options being preferred.
But Deila says Scepovic will get his chance and has simply suffered from an excellent level of competition within the Bhoys' squad.
The Serb, however, must be ready for that chance, with his current spell out of the side a test of his character. Indeed, the Norwegian has warned Scepovic he has to deal with the hard times and, however much he has already improved, improve further.
“We’ve big competition up front. Leigh has played well and John Guidetti has also played some good games," the Celtic boss told reporters.
“Stefan will get his chance - and he has to be ready. I have to see in training and in matches that he’s making improvement. Every player is frustrated when they don’t play but every player has been through hard times.
“It’s how you deal with hard times that shows your character. Stefan is working hard and we will see more of him. He’s improved but can improve more.”
Celtic face Dundee United later today in the Scottish Premiership, having just faced the same opposition three times in a row.
The Hoops beat United in the Scottish League Cup final and also knocked Jackie McNamara's men out of the Scottish Cup quarter-finals following a replay. Celtic currently sit three points clear of second-placed Aberdeen with a game in hand.