It is reported by Globo Esporte.
According to the publication, the parties have already agreed on a battle, but the contract has not yet been signed.
The tournament should take place on March 14, 2020.
Kunchenko has 20 victories and one defeat in his career in MMA. Dos Santos has 21 won the match and six setbacks.
Earlier, former UFC champion Tyrone Woodley said he did not believe in Conor McGregor's chances in a fight with Jorge Masvidal.