The Bianconeri hold a 3-0 lead from the first leg at Parkhead, but Conte believes that Celtic are a side that will not give in without a fight.
Whilst the Italian manager admitted that his side were heavy favourites to qualify, Conte insisted that his side still had to turn in a professional and committed performance.
"Tomorrow's game is important," Conte told Football Italia.
"We still have to play 90 minutes against a proud side who will want to recover the score from the first leg. It will be an important test for everyone - the players, me and the club. Celtic are a side who never give up. We need full concentration tomorrow.
"The result of the first game means we have a serious chance of qualification, but football can surprise if you don't face a game in the right way."
Conte also answered questions as to whether he could rest players that are one booking away from a suspension. Stephan Lichtsteiner, Claudio Marchisio and Arturo Vidal are all in such a situation.
"Those players who are on a yellow card will still be on a yellow card after tomorrow's game too. I'll have to evaluate things. Some people will play, while others could be rested. It depends on who else is available."
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