Source: UFC Vet Darko Stosic to Clash with Michal Andryszak at KSW 63
The winner of this clash will likely get a shot at the KSW heavyweight championship.
https://www.sherdog.com/news/news/SourceUFC-Vet-Darko-Stosic-to-Clash-with-Michal-Andryszak-at-KSW-63-181096