The Dublin super bantam and Cork super middle have both taken fights on short notice against home favourites on the MTK Global bill at the Emirates Arena in Glasgow.
Both over six rounds, McDonald takes on three-weight British title challenger Iain Butcher while Belujsky goes in against former Commonwealth champ David Brophy.
The fights tonight will be streamed live, with commentary, on YouTube.
McDonald is first up and is expected into the ring some time after 8:00pm while Belujsky is due just before 9:30pm.
You can watch the fights LIVE below: