The German striker has had a mixed start to life at Stamford Bridge since joining from RB Leipzig over the summer, scoring a very respectable eight goals in 14 games in all competitions but also missing a number of big chances.
That continued in France on Tuesday night, with Werner missing from six yards out in the fourth minute of the match, somehow blazing over the bar from close range.
He squandered another huge chance late in the match after being played in by Ziyech, firing a tame effort straight at the Rennes goalkeeper – though fortunately Olivier Giroud was on hand to spare his blushes and dispatch the rebound with a powerful header.
Ziyech did not appear best pleased with Werner, though, and before Giroud’s follow-up effort had hit the back of the net he could be seen screaming and gesticulating at his profligate team-mate.
Despite Chelsea grabbing their dramatic late winner, Ziyech did not forget the miss and as all the players celebrated in a huddle around Giroud, the Moroccan took the opportunity to speak to Werner.
He appeared to tell him that he cannot spurn such golden opportunities, with Werner acknowledging he could have done better with his effort and offering a brief apology.
Manager Frank Lampard has zero concerns about Werner and has been happy with his performances so far, saying: ‘I don’t know, he’s scored a lot of goals already and he’s adapting to a new league.
‘The chance today, Timo wants to score that but the ball’s bobbling as it comes along and I know myself that those finishes look a lot easier from afar than they always are.
‘I think it’s just normal that a player of Timo’s quality and where he is that he’s going to get even better, because he’s a top-class player.
‘I’ve been really happy with him since he’s got here. He’s feeling his team-mates and his team-mates are feeling him, hence he’s getting in positions to score in every game. So more goals will come as a progression from that.’