Frank Lampard lavished Willian with praise following the Brazilian's goalscoring display against Lille in the Champions League, while seemingly issuing a wake-up call to Christian Pulisic who was left out of Chelsea's matchday squad.
Having scuppered the chance to snatch a draw in their opening group stage clash with Valencia after Ross Barkley's penalty miss, the Blues were well aware that victory against Lille would be essential to boost their chances of reaching the knockout stages.
Leading through Tammy Abraham, the Premier League side were pegged back by Victor Osimhem ten minutes before half-time.
Dominating the ball, Chelsea continued to press and found the all-important winner through Willian in the late stages.