KSW middelweight champion Mamed Khalidov (26-4-2 MMA) will defend his crown against Dutch K-1 star Melvin Manhoef (27-10-1 MMA) in the main event.
KSW 23 takes place June 8 at Ergo Arena in Gdansk, Poland.
Khalidov holds a six-fight win streak. In his last fight he submitted (achilles lock) UFC veteran Kendall Grove in round two at KSW 21 - Final Resolution on December 1 last year.
Meanwhile Manhoef lost his last battle to Brock Larson via unanimous decision at One FC 8 - Kings and Champions on April 05 in Singapore Indoor Stadium in Kallang, Singapore.