Chelsea powered to a 3-0 win against 10-man Rennes in the Champions League on Wednesday.
Werner netted twice from the spot before half-time at Stamford Bridge after Rennes defender Dalbert conceded both penalties and got sent off.
Chelsea made the most of their numerical advantage to score again through Tammy Abraham early in the second half.
Chelsea keeper Edouard Mendy, who joined from Rennes in September, was rarely tested against his old club.
Mendy did make one good save to keep out Jeremy Dokumade’s strike in the final moments, giving the Senegal international six clean-sheets in his last six appearances.
Lampard’s side are top of Group E with seven points after three games and look well set to qualify for the last 16.
Chelsea have started a Champions League campaign with three consecutive clean-sheets in the group stage for the first time since 2009-10.
As well as keeping five successive clean-sheets in all competitions for the first time in 10 years, banishing the defensive problems that ailed them earlier this season, the Blues have scored 10 goals in their last three games.
