Defender Jarabica and midfielder Brusko, who play for Ceske Budejivice and MFK Dubnika respectively, have both been given permission by their clubs to train with United and take part in the friendly clash.
The duo will be looking to earn deals with the Whites, who have already signed Kasper Schmeichel, Billy Paynter, Paul Connolly, Fede Bessone, Neill Collins and Lloyd Sam this summer.