Massimiliano Allegri accused his players of being distracted by their looming Champions League clash with Manchester United as they lost their 100 per cent start in Serie A against Genoa on Saturday.
Daniel Bessa's second-half header cancelled out Cristiano Ronaldo's opener as Juve dropped points for the first time in the league this season.
Ronaldo's 400th career goal in Europe's top divisions had put the champions in control, but complacency crept into their display some time before Bessa capitalised on a defensive error to snatch a 1-1 draw.
Allegri felt his side paid the price for thinking ahead to their clash with United at Old Trafford on Tuesday and was frustrated by the inconsistency of their display.
"We left the game after a good start," he told Sky Sport Italia. "We conceded a goal from a loss of focus. These are situations that shouldn't happen. They're games in which the Scudetto can be won and lost.
"We played, from a certain point of view, with our heads in Manchester. We had to win. We went from frantic to sleeping and vice versa."
Bessa headed in Christian Kouame's cross from near the corner flag 67 minutes in after Juve's defenders had come to a standstill, apparently expecting the initial loose ball to bounce out of play.
Allegri hopes the lack of concentration will serve as a warning going forward.
"A good 10 minutes before the goal, we were already drifting out of the game," he said. "It was coming; we could see it from the touchline. I think it'll be good for us. Everyone will now remember that nothing can be taken for granted.
"The ball was bouncing around for three or four seconds, so we had all the time needed to go and mark the players in the box, but we had already been drifting out of the game for a while earlier."
Juve are seven points clear of Napoli at the top of the table after nine matches, but that gap will be closed to four if Carlo Ancelotti's side win at Udinese.
|Tuchel confirms Rabiot out of PSG contention|
|Madrid derby kick-off confirmed for February 9|
|Benzema fit to face Sevilla despite broken finger, Solari confirms|
|Bournemouth boss Howe says no offers received for Wilson|
|Kerber cruises after Wozniacki, Sabalenka upsets|
|Mbappe a great player and great person, says beaming Beckham|
|Gracia confident someone will step up if Doucoure leaves for PSG|
|Albrighton signs new Leicester deal|
|Niasse joins Cardiff on loan from Everton|
|Hendrick credited with Fulham strike|
|Western Sydney Wanderers 1 Adelaide United 2: Goodwin compounds Wanderers woes|
|Chahal and Dhoni carry India to ODI triumph|
|Levante report Barcelona for alleged use of ineligible player in Copa del Rey|
|Solskjaer regrets Sanchez´s Reading setback|
|Tomic brands Hewitt a ´liar´ as feud continues|
|Ruthless Nadal thrashes teenager De Minaur|
|Wozniacki enjoyed status as defending champion in Melbourne|
|Solskjaer backs Mourinho to return to football´s big time|
|Murray to miss Open 13 Marseille|
|Solskjaer´s United turnaround no easy task, says Hughton|
|The big Friday Premier League quiz|
|How James Harden´s 2018-19 numbers compare to his MVP campaign|
|It´s insane! - Tsitsipas excited to face ´legend´ Federer|
|Sharapova ends Wozniacki title defence|
|American teen Anisimova sends records tumbling at Aus Open|
|Lakers survive Ball´s gaffe to beat Thunder in OT|
|Federer expects ´athletic´ and ´attacking´ Tsitsipas clash|
|Alcacer is fit and available – Favre|
|Fantastic Federer breezes past Fritz|
|Pogba happy with Man United approach under Solskjaer|
|Mickelson leads Desert Classic, ties career-low with 12-under 60|
|Warriors´ Durant on Curry: He´s a once-in-a-generation, once-in-a-lifetime talent|
|Patriots owner says Brady is greatest player, not just quarterback, of all time|
|Inglis to retire from representative duty this year, NRL in 2020|
|Is Beal better without Wall? Wizards star says it´s ´absolutely nonsense´|
|Rockets C Capela undergoes thumb surgery, expected back after All-Star break|
|This Week in U.S. Sports: Irving apologises, Machado´s agent isn´t happy|
|Knicks in woeful shape, but 2019 could still be bright in New York|
|Valverde not worried about Levante´s Copa appeal|
|Nowell an option for England at flanker, reveals Jones|
|Pellegrini: Arnautovic available for the right price|
|Knicks throw away 19-point lead and lose on last-second goaltending call|
|Tebow invited back to Mets´ major league spring training|
|Canelo and Jacobs agree unification fight|
|Barcelona 3 Levante 0 (4-2 agg): Dembele at the double as Barca advance|
|Levante to lodge complaint over Barcelona Copa selection|
|Kanter´s London absence ´very unfortunate´, says NBA commissioner|
|NBA could swap London for Paris in 2020|
|Spurs coach Popovich uncertain if he will return next season|
|Pistons´ Griffin fined for verbal abuse of official|
|Everton do not have financial conditions to enter transfer market - Silva|
|Andy Cole joins Sol Campbell´s coaching staff at Macclesfield|
|Atletico confirm Saul has thigh injury|
|Wood replaces injured Stone in England squad|
|Lebanon 4 North Korea 1: Disciplinary record cruelly denies Radulovic´s men|
|Saudi Arabia 0 Qatar 2: In-form Ali bags brace as Qatar top group|
|Robertson signs new Liverpool deal|
|Vunipola backs Farrell to thrive in solo leadership role|
|People don´t know what´s going on behind the scenes - Mourinho defends United stint|
|Indefatigable Muguruza knocks out Konta at 3:12am|
|Serena coasts, difficulties for Halep and Muguruza´s marathon|
|Lowry retains Abu Dhabi lead|
|Djokovic battles past Tsonga, young guns flourish|
|Louisville airport to be renamed in Muhammad Ali´s honour|
|Emery not thinking about Ozil speculation|
|Sri Lanka hopeful over Kusal Mendis finger injury|
|Oman 3 Turkmenistan 1: Last-gasp Al-Musallami guarantees progression|
|Emery wants Cech to end career ´in a good moment´|
|Japan 2 Uzbekistan 1: Shiotani stunner seals comeback and top spot|
|Calhanoglu deal ´financially impossible´ for Leipzig|