Schifcofske, 32, is a goal-kicking wing or full-back who spent 10 years playing rugby league before switching codes and signing for the Reds in 2006.

Ulster beat off strong competition to sign Schifcofske, an Australia A international, who had reportedly attracted offers from two NRL clubs keen for him to return to rugby league.

O'Donoghue, a 25-year-old lock, was born in London but raised in Brisbane and played for the Australia Under-19s before enjoying stints with Northampton and Worcester.

He made 13 appearances for the Reds in last year's Super 14 and joins Ulster as a replacement for Justin Harrison, who has left Ravenhill for Bath.

Tommy Bowe, Neil Best, Roger Wilson, Mark Bartholomeusz and Kieran Campbell are also leaving Ulster this summer.

Coach Matt Williams said: "Clinton is a hugely respected figure in Australian rugby union and rugby league.

"He's an experienced captain and leader, essential qualities with our young back line. Clinton is also a very high percentage goal kicker and a confident Super 14 player.

"Ed is a rare find. An experienced European player currently playing Super 14 and Irish qualified. He is great replacement for Justin Harrison at Ravenhill."