The Galway light middleweight was due to face unbeaten Scottish southpaw Kieran Smith [12(6)-0] on a big BoxNation bill at the Emirates Arena in Glasgow next Friday [November 30th].
The vacant WBC International Silver minor rankings title was due to be on the line in the ten-round fight.
However, McDonagh is now out of the clash for unspecified reasons.
It was announced this morning that Smith will now face Hull-based Lithuanian southpaw Evaldas Korsakas [9(5)-5(2)-2] – the current BBBoC Central Area champion.
The fight was seen as a big opportunity for McDonagh who will turn 41 this month.
Unbeaten in his last 12 – including big wins over Shayne Singleton, Dean Byrne, and John Hutchinson – McDonagh last fought in May where he was held to a controversial ten-round draw by Hungarian Peter Kramer.
The card next week still features Belfast light welter Tyrone McKenna [16(6)-1(0)-1] who takes on another Scot in Lewis Benson [10(2)-1(0)].