The Blues were the only English side not to finish top of their group and were punished for their slip by drawing the Spanish giants.
Barcelona and Chelsea face each other for the sixth time in the knockout stages, but the Blues will be encouraged by their recent record.
Chelsea are unbeaten against Barcelona in their last eight meetings and Conte has urged his side to remain confident.
He said: ‘It’s a draw and our reaction must be positive.
Chelsea 2017/18 Fixtures
Huddersfield Town (A) – Tues Dec 12
Southampton (H) – Sat Dec 16
Bournemouth (H) – Wed Dec 20 (EFL Cup)
Everton (A) – Sat Dec 23
Brighton (H) – Tues Dec 26
Stoke City (H) – Sat Dec 30
‘As I know very well you must be ready to face everything and in this case you must ready.
‘The past is the past. Now is the present and it is another story.’
Chelsea beat Barcelona in their last meeting in Europe when they knocked the Spaniards out of the Champions League in 2012.
The tie will see Eden Hazard come up against Lionel Messi and Conte has issued a war cry to his most influential player and his team-mates.
‘This type of game is a good chance for every player to show the right value, not only for Hazard, but for every player in the right way.’
Chelsea have to travel to the Nou Camp in the second leg, but Conte does not see this as an issue.
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‘I think that we must be ready to play at home and away,’ he said.
‘It is impossible to see an advantage. Home and away if you want to hope to go to the next round.’
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