Conte reckons it will take a special effort to be crowned Europe's top dog, despite beating the odds in the Premier League last season.
Celtic suffered a 1-0 home defeat against Belgian side Anderlecht on Tuesday night.
Elsewhere, Roma recorded a 1-0 win over Qarabag at the Stadio Olimpico.
Christensen should have equalised from a Cesc Fabregas cross 10 minutes later, but the Chelsea defender somehow headed wide of the open goal.
Despite that, they look capable of breezing past Europa League teams of a significantly smaller standing in the latter stages of the second-tier competition.
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At Old Trafford, Nigerian striker Aaron Samuel was an unused substitute as CSKA Moscow lost 2-1 to Manchester United. Having already secured first place in Group D, Barca rested Lionel Messi as they faced Sporting CP at the Camp Nou, defeating the Portuguese side with a goal from Paco Alcacer and another when Sporting CP's former Barcelona man Jeremy Mathieu scored an own goal.
Napoli will also fancy their chances of making it to the latter stages of the competition after missing out on a place in the Champions League Round of 16 to Shakthar Donetsk.
Sporting will continue with the Europa League while Olympiakos are eliminated. Besiktas are unbeaten in the UEFA Champions League and even defeated RB Leipzig in Germany with their B team on Wednesday night.
Liverpool won their group after hammering Spartak Moscow 7-0 at Anfield tonight.
But with the January transfer window opening in less than four weeks, a host of Premier League scouts will have been more occupied with casting their eyes over European football's brightest talents.