Head coach Andy Farrell says Ireland will relish the opportunity to test themselves against the "best in the world" in Saturday's heavyweight autumn tussle against South Africa at Aviva Stadium.

Farrell's side prepared for a reunion with the double world champions with a record 46-19 win over Australia in Dublin on Saturday.

South Africa are the world's top-ranked team and have beaten Japan, France and Italy this month after retaining the Rugby Championship in October.

"[They are] the best in the world. Everyone's talking about them and the type of rugby that they're playing," said Farrell.

"A rich vein of form and rightly so. They've played some brilliant stuff.

"It's a fantastic way to finish off our autumn. The last game at the Aviva. The lads will know what it means to everyone in Irish rugby as well, so we'll look forward to that."

Farrell, who has won three out of four games against South Africa as Ireland coach, added: "You always want to test yourself against the best.

"Certainly in this moment in time, South Africa are definitely the best and we relish that sort of opportunity to see where we're at."