Tom Curry has been backed by the RFU after the England international was accused to have "smacked" Argentina head coach Felipe Contepomi on Sunday.

After England's narrow 27-23 win, Contepomi claimed to have been shoved and told to "f*** off" by Curry in the tunnel, with the Argentina coach adding it is "probably part of his [Curry's] nature to bully people".

An official complaint was lodged later on Sunday.

Six Nations oversees the running of the autumn internationals, including its disciplinary processes. RFU CEO Bill Sweeney confirmed the complaint has been lodged, the RFU is cooperating with the investigation and will back the England flanker in the proceedings.

"We're aware that Argentina have sent a letter in to Six Nations. We're cooperating with Six Nations fully on a review in terms of any conversations that need to be had," Sweeney told Sky Sports.

"So it wouldn't be appropriate to talk on that process now. We back Tom fully. We know he's got impeccable character, really high values and we respect him, more than respect him highly, so we'll go through that process."

The initial flashpoint was Curry's late tackle on Juan Cruz Mallia in the 75th minute that forced the full-back to leave the field. Argentina confirmed on Monday that he has suffered an ACL knee injury.

Contepomi left the coach's box to protest against the tackle and at the final whistle a brawl broke out between the teams that then extended to the flashpoint with Curry.

The incident has raised questions about the image created for the sport, but Sweeney thinks it can be chalked down as a rare incident on an occasion where the stakes were high for both sides.

"It doesn't happen hardly at all. Rugby is a contact sport, emotions run high. It was a really tight finish," he added.

"Can I mention the Argentinians felt disappointed they weren't able to close out for them and we were delighted that we were able to close out. So they don't happen very often.

"When they do, we don't want to see them happen, but it's a tough emotional sport."

Sweeney also opened up on the threat of the new rugby competition R360 but insisted there has been no further updates since the unions urged "extreme caution" to anyone considering involvement in R360 and deemed players who join ineligible for international selection.

Rugby360, or R360, is a proposed global rugby union competition aiming to revolutionise the sport.

It plans to unite the world's top players in a franchise-based league that travels from city to city - London, Miami, Tokyo, Lisbon, and more.

The project is fronted by England's 2003 World Cup winner Mike Tindall, former Bath director of rugby Stuart Hooper and a small executive team.

As many as 200 players are believed to have signed pre-contracts, some reportedly worth up to £750,000.

However, none have publicly confirmed their involvement - likely due to the uncertainty surrounding international eligibility and the league's sanctioning status.

"We don't focus on it too much. I mean, I think you can only manage and control what you can control," Sweeney said.

"So we're just focused on running the business side of things here. We're focused on how do we continue to develop the women's game and we want to make sure this is the best environment for women to play their rugby, both at the league level and international level and very similarly on the men's side. So we can only focus on that.

"I haven't heard anything further on R360. I haven't heard any more facts or updates or status. So we'll just continue to do what we do.

"I think we've said that and we came out, the eight unions came together and issued a statement really clarifying their policy on selection.

"And we don't have the confirmed details or proof of funding or investment that's supporting those monies. So we would urge caution."