Oliveira says he is always ready to fight Khabib Nurmagomedov inside the Octagon

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 But Oliveira has doubts about whether former UFC champion Khabib will return for the fight

 Oliveira has said that “Whenever [Khabib] he’s willing to get back and get on with it.  I'll always be ready,”

 Honestly, I don't think he's going to be fighting again.  He said he's retired, he's done.

 Khabib Nurmagomedov retired from UFC after defeating Justin Gaethje at UFC 254

 Since then there have been many such moments in which it was felt that Khabib might once again return to fighting but this has not happened yet.

 Charles Oliveira will fight for the title against Islam Makhachev at UFC 280 in the UAE on October 22

 Oliveira has said that he will challenge Khabib Nurmagomedov by defeating Islam Makhachev at UFC 280

 Islam Makhachev hopes he can challenge Khabib Nurmagomedov and force him to return from retirement