Mikel highlights Blues' lapse
Chelsea midfielder John Obi Mikel admitted he and his team-mates "switched off" to allow Juventus to claim a point at Stamford Bridge.
Oscar looked set to enjoy a dream Champions League debut with a first-half double, but the Italian champions ruthlessly exposed the holders' defensive deficiencies to snatch a draw.
Arturo Vidal pulled a goal back before the break and Fabio Quagliarella came off the bench to equalise for the Italian champions.
"We started the game well and scored two goals and had the game under control," Mikel told Sky Sports 2.
"They scored one goal and then in the second half we tried to start the same way as we had in the first.
"It was a cheap goal to give away, the second one for them. I think we switched off, we should have dealt with it properly."
Chelsea boss Roberto Di Matteo admitted he was "deflated" after seeing a two-goal lead slip.
"It was a very good football game and both teams could have won it," he said on Sky Sports 2. "We had chances with a third goal to close the game but I think it was probably a deserved draw.
"We found ourselves in a great position to win the game and we only got a draw but we knew we were playing a quality side who have a lot of good players.
"We feel a little deflated because we were ahead but it's going to be a tough group and we get on to the next game now."
Asked about the performance of Oscar, Di Matteo added: "We were just waiting for the right game for him, it was wonderful to watch. The second goal was fantastic."