With Leicester's beleaguered forwards looking increasingly forlorn, the Ospreys squeezed further penalties from their tired and dejected opponents, with Hook adding six points with two fine penalty strikes to seal the game and the trophy.
McGeechan praised the contribution of Wales fly-half James Hook, whose 16 points from penalties and two conversions ultimately made the difference between victory and defeat.
The Ospreys had to rely on the boot of James Hook for all their points, the fly-half kicking seven out of eight penalties as Munster defended fiercely.