Australia lock Darcy Swan will miss the remainder of Australia's Test series with England, after being suspended for two weeks following his headbutt on Jonny Hill.

The Brumbies second row was red carded after 33 minutes of last Saturday's first Test in Perth. He had clashed with the England lock, with Swain headbutting Hill after the Exeter man pulled his hair.

Hill was sin-binned for his role in the incident, while the Wallaby was shown a red card by referee James Doleman, before Australia went on to stage a late comeback and win the series opener 30-28.

Swain has now been banned for two weeks by an independent disciplinary committee, meaning he will now miss the Tests in Brisbane and Sydney on 9 and 16 July respectively.

The Australian challenged the red card at his hearing, but while the red was upheld he was still given full mitigation, with a further week removed from the suspension, which was deemed "wholly disproportionate" by the committee.

"The committee deemed the act of foul play merited a low-end entry point of six weeks given the provocation before the incident, low degree of force exerted by the player and that no injury was caused to the victim. This resulted in a starting point of a six-week suspension.

"Having acknowledged mitigating factors, including the player's acknowledgement of foul play, clean disciplinary record, conduct at the hearing and expression of remorse, the committee granted the player full mitigation of 50% of three weeks," a World Rugby statement reads.

"The committee further determined that given the above off-field mitigating factors and that a three-week sanction would be wholly disproportionate given the level and nature of the offence, the sanction was further reduced by an extra week, resulting in a sanction to weeks."

Meanwhile, Sam Underhill (below) is poised to fill the void in England's back row created by Tom Curry’s tour-ending concussion for Saturday’s second Test.

Underhill was overlooked altogether for the 30-28 defeat at Optus Stadium but is winning the race to be selected at openside flanker ahead of Lewis Ludlam and Jack Willis.

The Bath back row was a star of the 2019 World Cup but since Japan he has been limited to winning only 13 caps due to concussion, Covid, illness and injury, making just one appearance in the recent Six Nations.

Now he is poised to lead the defensive stand at Suncorp Stadium as England took to take the series to a decider, with Ludlam expected to continue on the bench.

"Sam’s work rate on and off the ball are excellent. He’s a really good defender, particularly with his chop tackles," said England's defence coach Anthony Seibold, who joined Eddie Jones’ coaching team in the autumn.

"He’s played at a high level. I’m thinking of New Zealand at Twickenham in 2018 and, watching his performances at the World Cup from afar, he was a standout for me."

Additional reporting: PA