The Brazilian defender has been a good servant to the club, making over 250 appearances over two spells.
He has helped them win multiple trophies including the Champions League and the Premier League.
It looked as if he would be at Chelsea for at least another few years.
He penned a two-year contract extension in May, where he reiterated his 'love' for the club.
However, just three months later he decided to force a move away.
Luiz trained away from the squad on Wednesday after informing Frank Lampard that he intended to move to London rivals, Arsenal.
He completed the move on Thursday evening.
One Chelsea fan vented his frustration by pretending to punch a poster of Luiz on live TV.
And other Chelsea fans have found a way to get back at him.
Many of the club's supporters have decided to leave one star ratings on Luiz's restaurant, Babbo.
You can read some of the best reviews below.
Dean Gargate wrote: "From a champions restaurant to 4th best restaurant in Mayfair. Starting to slip to 5th or 6th. Standards dramatically dropping.'
"I was eating with my Mrs and a snake came out of nowhere and attacked us, luckily I fought the snake off, he was last spotted slithering his way to North London. Not a good experience," Tom Simpson wrote.
Slaviša Janjič wrote: "Very dirty looking restaurant, rats all over the floor and curly hair in every food, owner seems like very disloyal person, he doesn't really care and isn't' around on Thursdays..."
"Absolutely shocking restaurant. Overpriced and management don't seem to care or have any sort of morals. I can honestly only see it lasting another year or so anyway before being replaced with a newer more vibrant restaurant," Elliott Wilson's review read.
'Ben Dover' added: "I used to love this restaurant - the food was great. It has gone down dramatically though. To think of a metaphor it's like going from a Champions League rated place to more of a Europa League standard. AVOID."
And Will Lures wrote: "The owner is very unloyal. Every time I would show up to see him on Thursday night he was never there? I really don’t know why because he said it was only suppose to be Tuesday and Wednesday’s but I guess he was persuaded by more money."
Arsenal fans have also started leaving five star reviews to counter those of Chelsea fans.
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