Frank Lampard thinks Eden Hazard's form makes him the best player in the world at present but hopes his Derby County side are not forced to deal with the winger when the two teams meet in the Carabao Cup on Wednesday.
The former Blues midfielder returns to Stamford Bridge for the first time as a manager with the Championship side, who knocked out Manchester United in the last round.
Maurizio Sarri could be tempted to rest Hazard, who has already played 11 times this season but did sit out the wins over BATE Borisov and Burnley last week with a back problem.