Ancelotti careful with fitness of Chelsea midfielder Lampard
Lampard, 32, has been training on his own as he recovers from a groin problem.
But the midfielder is not expected to be back in contention until the Champions League match against Spartak Moscow on November 3 or the trip to Anfield four days later.
Carlo Ancelotti insisted: "We don't want to take a risk. He will start training with the team next week and we will know more after that.
"He won't be able to start against Blackburn but he will be able to play the week after.
"Lampard is a big miss. He scored a lot of goals and will do so again. The team's done well without him but we need a midfielder with his skills."