Cavan produced one of the shock results of the weekend beating Monaghan 2-15 to 1-17 in Clones last Saturday.
The Breffni men trailed by 7 points at half time before fighting back to make it 1-13 apiece at full time.
Penalties looked to be on the cards when Monaghan shot stopper Rory Beggan levelled the game deep into injury time.
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Cavan Goalkeeper Raymond Galligan then landed the winning score from just inside the 65 metre line.
Manager Michael Graham said his side showed great composure when under pressure
