12 Dec, 11:30
The Ireland Under-19 team to face Australia Schools at Ravenhill this Saturday afternoon (kick-off 2.30pm) has been announced.
The 19-year-old scored a try in Munster's 21-14 victory over defending champions Connacht last month in the IRFU U-20 Interpros, and also wore the number 15 jersey for their games against Leinster and Ulster.
The Bandon Grammar School star had already represented Munster at Under-18 and Under-19 levels, and was capped as a Irish hockey international at the Under-16 grade.
Sweetnam is understood to have informed his GAA club, Doheny's, and Cork hurling officials about his decision over the weekend.
Cork senior hurling manager Jimmy Barry-Murphy said: "Darren is a very talented hurler and while we are sorry to lose him, we wish him every success in his chosen career."