The former Blues striker has joined arch-rivals Spurs on loan until the end of the season with a £15million option to buy from RB Leipzig.
Werner never lived up to his prolific reputation and £45million price tag during two underwhelming years at Stamford Bridge.
But he did help Chelsea win the Champions League in 2021 alongside Arsenal's Kai Havertz and Manchester United's Mason Mount in attack - with all three players now at rival Premier League clubs.
A section of Blues fans never lost faith in Werner's potential and continue to argue that the Germany international would be useful, particularly in light of the club's shocking form since his exit.
They shared their dismay on Werner's Instagram as the 27-year-old posed in a Spurs shirt for the first time.
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One wrote: "Gonna take a while to sink in."
Another said: "I'm not mad because I know you want to get your career back on track but it just hurts to see…"
A third put: "Oh Timo, what have you done."
Ex-Tottenham midfielder Jamie O'Hara twisted the knife by arguing that Werner would 'walk' into Maurcio Pochettino's goal-shy Chelsea team.
The Sports Bar host told talkSPORT: "He was at Chelsea when Chelsea were successful.
"Let's not get away from that fact. The standards were massively high when Werner was at Chelsea.
Graeme Souness and Simon Jordan slam Timo Werner joining Tottenham on loan for the remainder of the season
"People got frustrated with him because they were comparing him to Drogba. But they would have him now! Werner would walk into that [Chelsea] team."
O'Hara added: "I rate him. We know he misses chances. Jason Cundy has seen him more than most - and he said Werner will frustrate.
"That's probably right. He will frustrate us. But if you look at the strengthening of the squad that Tottenham needed to do, it's a really good signing.
"He's worth taking a punt on. He's quick, he's played at the highest level, and I think he'll score goals for us. Ange will get the best out of him.
"I'm really happy about it."