John Terry says last season's disappointment is acting as a warning for Chelsea's players.
This time last year, Chelsea were top of the Premier League on goal difference from Liverpool and eight points clear of Manchester United, who had a game in hand.
But a Champions League draw in Bordeaux was followed by defeat at home to Arsenal and they won only four of the next 10 before Luiz Felipe Scolari was sacked in February.
Scolari's painful lesson will guide Ancelotti, especially as Guus Hiddink is already making noises about a possible return to club football after Russia's failure to reach the World Cup final.
"We've had a good start but we're not getting carried away," said Terry. "We started well last year and then threw it away."