Werner, who joined Chelsea from RB Leipzig in the summer, scored twice from the penalty spot to help the Blues beat Rennes 3-0 in their third group stage match of this season's Champions League and put them in the driving seat in Group E.
Italy international Jorginho had been first choice for spot kicks ever since Eden Hazard's departure last summer, but last week's miss against Krasnador and a miss against Liverpool earlier this season played into Lampard's thinking.
Werner, however, emphatically finished both penalties against Rennes, justifying Lampard's decision.
"If Timo takes them as well as today he'll be happy. I'm happy he scored. Timo is as it stands now but of course he needs to keep scoring them. Today he did it very well."
With Werner now on penalty duty, his chance of winning the Golden Boot has certainly improved.