100th Test is Oz-some challenge.

Ireland v Australia IRELAND captain Brian O'Driscoll will clock up a century of Test appearances when he faces Australia tomorrow.

And the 30-year-old centre, who has played for his country 93 times and made six appearances for the British and Irish Lions, is right up for the challenge.

Australia lost six of their previous seven games before defeating England last week but O'Driscoll won't take them lightly.

He said: "Australia are a very smart team, the smartest in world rugby. They're able to adapt on the pitch, changing from Plan A if they need to. That makes them dangerous but also a great challenge."