England and Harlequins prop Joe Marler shared Haskell's disdain for the decision, calling it "utterly ridiculous".
Haskell missed England's opening two matches of this year's Six Nations championship after being given a four-week for a dangerous head-high tackle on Harlequins centre Jamie Roberts.
"Thank you so much to everyone at the Ricoh and those who sent me messages. Yesterday was sad in many ways, but also really positive," said Haskell in an Instagram post thanking fans for his warm reception at the Ricoh Arena.
"I have never had a reception like that, nor ever heard my name chanted. Mainly when someone shouts my name its because I am in trouble.
"I have loved my time at Wasps and look forward to finishing the season with the boys. Wasps has never been about location or stadium. Its been about the players and our great fans, new and old! I have been surrounded in the changing room by amazing characters from start to finish.
"I have laughed 100 times a day everyday for 17 years and couldn't not have wished for more. I still have a lot of rugby left in me, so whilst this is the full stop on one journey, a new chapter will start soon."
Wasps now face a trip to Newcastle Falcons on Saturday to decide the make ups of the semi final clashes.
Having played abroad for the Highlanders and Stade Francais in the past, Haskell could once again be forced to move overseas with no offer from a Premiership club on the table for next season.
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