Now that Francis Ngannou is without an opponent for UFC 215, the rising heavyweight has called on Alistair Overeem to step in, and fight him September 9th.

Ngannou was booked to fight Junior dos Santos at the upcoming event, but the latter’s been pulled from the card, due to a potential, anti-doping violation (dos Santos’ manager has denied that the fighter used any banned substances).

Well, recently Ngannou tweeted out the challenge below to Overeem:

Overeem just fought in July, and earned a majority decision win over Fabricio Werdum.  Obviously Overeem – Ngannou is a fight a lot of folks would like to see no?