Sean Jansen ruled out of Ireland's Fiji and South Africa matches

Sean Jansen has been ruled out of the remainder of Ireland's Nations Championship campaign after sustaining a knee injury during Friday's 42-12 win over Argentina in Dublin.

Jansen's home debut ended after just 46 minutes because of the knee problem, and with Caelan Doris and Jack Conan already injured his absence further depletes Andy Farrell's options at number eight. He will return to Connacht to continue his rehabilitation.

Hooker Dan Sheehan will miss Saturday's home match with Fiji (20:10 GMT) after sustaining a concussion against the Pumas; he served as squad captain in Doris' absence. Sheehan is a doubt for the South Africa game on 21 November as he undergoes 12-day return-to-play protocols.

The coaching staff are "hopeful" wing Rob Baloucoune (cramp) and flanker Josh van der Flier (ankle) will be available. Farrell also said Mack Hansen picked up an ankle problem in the Argentina game, but the winger was not mentioned in the Irish Rugby Football Union (IRFU)'s squad update on Monday.

With mounting back-row injury issues, uncapped Ulster forward David McCann has been called up, while Gus McCarthy has joined the squad to boost Farrell's options at hooker. McCann and McCarthy were originally named in the Ireland XV squad for their fixture against Fiji 'A' in Cork on 20 November.

Tom Ahern (neck), Ethan McIlroy (thumb) and Michael Milne (ankle) have been ruled out of the Ireland XV game, with Fineen Wycherley, Todd Lawlor and Jeremy Loughman called up as replacements. Centre Bundee Aki, a late withdrawal from the Argentina game with illness, is expected to resume full training on Tuesday.

After facing Fiji and back-to-back world champions South Africa at Aviva Stadium, Ireland will travel to Twickenham for a finals weekend fixture.

Ireland's immediate schedule sees the home game against Fiji on Saturday at 20:10 GMT followed by the South Africa fixture on 21 November at the Aviva Stadium; meanwhile, Jansen will continue his rehabilitation with Connacht.