'I definitely got that one wrong' - Arnold admits he could have seen red for Zebo tackle

Toulouse lock Rory Arnold admits he feared he could have been red-carded during their dramatic Heineken Champions Cup quarter-final win against Munster on Saturday.

The defending champions booked a semi-final date with Leinster back at the Aviva Stadium after their nail-biting 4-2 win in a place-kicking competition, after a 24-24 draw.

The Australian lock was at the centre of a big incident in the second half, when he was yellow-carded on 50 minutes following a dangerous tackle on Simon Zebo, having lifted the Munster player's legs above the horizontal and driven him into the ground.

After consulting with the TMO, referee Luke Pearce judged that with the Munster man landing on his back rather than his head, a yellow card would suffice, with Arnold spending the next 10 minutes in the sin-bin before helping his side come from 24-14 down to send the game to extra time.

Speaking ahead of this Saturday's return to Dublin, the 22-cap Wallaby says there was an element of relief to see the card he received was yellow rather than red.

"I was [relieved] to be honest," Arnold said.

"I definitely got that one wrong. If I was shown red then, it would definitely drastically changed the outcome of that game.

"I was very lucky there and I need to be better around that collision zone."

At the time Toulouse were behind by seven points, with Munster stretching their lead to 10 while Arnold was in the bin.

And the lock says a similar mistake this week against Leinster could be punished further.

"Absolutely, these big games are usually quite close. So a yellow card or red card, it will be devastating if a team gives it away, especially a red card."

The 31-year-old, whose twin brother Richie is also on the books of the five-time champions, is expecting