Jamie Redknapp has warned Chelsea boss Thomas Tuchel that Romelu Lukaku is his 'biggest challenge'.
The Belgian striker is still short of match sharpness and confidence since being reinstated into the starting XI following his fall-out with the Blues boss after criticising his tactics in an Italian interview.
And Lukaku spurned a couple of good chances to score in the 2-0 win over Tottenham on Sunday.
Chelsea striker Romelu Lukaku looked laboured in the victory Tottenham on Sunday
Redknapp told Sky Sports: 'His biggest challenge right now is probably Lukaku.