The Germany international went 14 games without scoring for the west London side in the Premier League but finally ended that goal drought when he netted in the 2-0 win over Newcastle United last month.
Werner, 24, will now be hoping to push on and help Chelsea FC to challenge for Champions League qualification this season.
The forward has now admitted that his long goal drought in the Premier League was probably one of the most difficult periods in his career.
Speaking in an interview with Sky Sports before the Premier League clash with Manchester United on Sunday, Werner said: “The period when I didn’t score in the last month was maybe the worst time in my career.