The duel, which received contender status, was officially announced by representatives of the American League.
30-year-old Valentin Moldavsky had two fights last year, losing by unanimous decision to Ryan Bader in a unification match in January, and accidentally hitting Steve Mowry in the eye in August, as a result of which the fight with the American was declared invalid.
Linton Vassell, 39, is on a four-fight streak with a split decision win over Tyrell Fortune and TKO finishes against Sergey Kharitonov, Ronnie Marquez and Timothy Johnson.
Currently, Valentin Moldavsky and Linton Vassell occupy the first and second lines in the Bellator heavyweight division rankings, respectively.