The Bhoys boss is feeling good ahead of his side's Champions League qualifier.
Indeed, the Bhoys boss was at pains to point out exactly what Qarabag should fear in Glasgow, talking up the Scottish champions' form and chances.
Deila by no means underestimates the Azerbaijani club, speaking about their quality during his Friday afternoon press conference - but it is Celtic's qualities he insists should be feared.
Highlighting the Bhoys' form and home advantage, the Norwegian sent a buoyant message to the Qarabag camp, suggesting it will be tough to beat his men at Parkhead.
RD: We have had good results in the last six months, we're improving all the time and playing at Celtic Park is never easy.— Celtic Football Club (@celticfc) July 24, 2015
RD: They're going to face a good team, big club and we're going to show ourself from the best side on Wednesday. It'll be tough to beat us.— Celtic Football Club (@celticfc) July 24, 2015
Deila also emphasised the role Celtic's fans play in making the club so revered across Europe.
Indeed, the Norwegian believes playing against 60,000 fans at Parkhead is the 'worst thing' an opponent can possibly experience. And he has called on the supporters to 'strike fear' into the Azerbaijani side.
RD: To play at Celtic Park against 60,000 home fans is the worst thing you can do as an opponent.— Celtic Football Club (@celticfc) July 24, 2015
RD: It strikes fear into everybody. We have the best fans in the world and that's what we have to show on Wednesday.— Celtic Football Club (@celticfc) July 24, 2015
Ahead of Celtic's Champions League clash, the Hoops host Rennes in a friendly match on Saturday afternoon, the perfect warm-up for another home clash against European opposition the following Wednesday night.