Leigh Griffiths' stunning free-kick winner against Ross County on Saturday continued Celtic's domestic dominance but he acknowledged a much tougher midweek task in Europe.
The Scotland striker came off the bench in the second half at the Global Energy Stadium as the Hoops struggled to break down a resolute Staggies defence.
And his strike from 30 yards in the 78th minute gave the visitors a 1-0 Scottish Premiership win and extended Celtic's unbeaten run in Scotland to 64 games while taking them six points clear of Aberdeen.
Next up in a busy schedule of fixtures is a trip to France to play Paris St Germain, who won 5-0 when they visited Parkhead in September.
Griffiths is hoping Celtic put on a better show on Wednesday night but said: "They are favourites to win the competition and rightly so.
"They have been on fire.
"After they beat us, they went and beat Bayern Munich 3-0.
"We know how hard it is going to be but that is why we are in this competition, we want to go and compete against the best and if we get beat, we get beat and we will take it on the chin.
"But we look to try and get a result."
Griffiths returned to action after recovering from a calf injury and finds himself again in a fight for a starting place with Moussa Dembele, who scored a hat-trick in 12 minutes for France Under-21s earlier in the week.
He said: "Moussa has come back and he has been on fire again. It shows how hard he has worked to get back fit.
"If I wasn't injured last week maybe I would have got a goal or two then. I have been working with the physios to get back as quickly as I can and I showed I am still here.
"We have a big week.
"The manager will take into consideration we have a (Betfred) cup final (against Motherwell) at the end of the week so it will be a difficult choice for him to make.
"But anyone who starts the game will more than deserve to play."
County boss Owen Coyle took encouragement from his side's performance against the league leaders.
The former Republic of Ireland international said: "Nobody enjoys losing games but that group of players gave everything and if they continue to do that - you don't play against Glasgow Celtic every week - there is going to be a lot of points available to us."