Lesnar retired from the UFC on December 30th, 2011 after losing in a first-round match against Alistair Overeem. After his retirement announcement, rumours from the Internet wrestling community were circulating that Lesnar would return to the WWE.
Lesnar has wrestled in Japan in the past. He competed for New Japan Pro Wrestling in October, 2005 after leaving the WWE, and achieved massive success within the promotion. Japanese wrestling fans were overjoyed upon hearing the news that Lesnar arrived in Japan, and were rabid upon seeing him in the ring. If he did make a return to Japan, he would no doubt be welcomed with open arms.
If this potential match between Lesnar and Emelianenko were to take place, Lesnar would have to get approval from UFC president Dana White to compete. Lesnar currently has a “Retirement Contract” with the UFC which prevents him from competing for any other company.
Since leaving the UFC, Lesnar has not commented on competing for any other promotion or company. It remains to be seen if he even has any interest at all about getting back into the ring, whether pro wrestling, MMA or any other.
If the IGF were able to recruit both Lesnar and Emelianenko it would definitely raise their status to be on par with other successful promotions in Japan such as New Japan Pro Wrestling and All Japan Pro Wrestling.