The Hoops reached the last 16 of the competition last year, beating Barcelona on the way before losing to Juventus, and qualified for the group stages again this season after three nervy qualifying rounds.
Looking forward to the first fixture in a section that also contains Barca and Dutch side Ajax, the Celtic boss said: "It feels fantastic.
"Everything we have worked on since we were eliminated from the competition in February by Juventus has been geared for the start tonight [Wednesday].
"I am very happy with the way the players dealt with the huge pressure they were under in the qualification games and now it is a different type of pressure.
"The expectation level isn't so high but we set new challenges for the players.
"Can they emulate what they did last year?
"It is going to be hugely difficult we know, but the experience they gained last year will hopefully stand them in good stead going into this campaign."