Leinster back row Sean O'Brien has replaced Denis Leamy on the bench for Ireland's concluding autumn Test against South Africa.

Leamy has failed to recover from the ankle injury sustained in last Saturday 41-6 victory over Fiji and will miss the international at Croke Park.

O'Brien won his first cap against the Fijians, coming on as a second-half replacement for Leamy.

A statement released by Ireland read: "Leamy was undergoing rehabilitation throughout the week and while he has progressed well, the injury has not recovered fully to allow him to take his position among the replacements."