DRAGONS flanker Lennon Greggains believes Wales can take heart from packing a punch against physical Argentina for their tough World Rugby U20 Championship encounter with champions France, writes Chris Kirwan.

The Welsh youngsters face Les Bleuets in Rosario on Saturday (kick-off 5pm) on the back of a fine 30-25 triumph against the hosts.

The nervy success, earned by 20 points from the boot of fly-half Cai Evans and tries by scrum-half Harri Morgan and wing Ryan Conbeer, gives Gareth Williams' side a shot at the semi-finals.

However, to do that they must upset the French, who won the tournament on home soil last year and started the defence of their crown with a 36-20 win against Fiji, who Wales face on Wednesday.

"It was great to come away with the win, we knew that Argentina on their own patch would be a big challenge. First one down, four more to go," said Greggains, who was forced off in the first half with a shoulder injury and will be assessed ahead of the French clash.

"It was tough in front of their crowd and there was a lot of pressure on us as a pack to perform because we knew that Argentina would be physical.

"They pride themselves on their scrums and driving maul but we managed to have some success with a few scrum penalties, some metres in the drive and I don't think we lost many balls on our attacking lineout. There are things to work on for France, which will be just as tough."

Wales lost 32-10 to France in February's Six Nations opener in Vannes, were beaten 24-3 in Colwyn Bay in 2018 and 40-20 in Montauban in 2017.

However, Greggains is confident that the Under-20s can beat Les Bleuets for the first time since the class of 2016's 16-10 success.

"We can take a lot of confidence from the win but France are the champions, so we know that we have to be on the top of our game," he said. "We are good enough to beat France, Fiji and whoever comes after that."

Dragons centre Aneurin Owen was also forced from the field after a clash of heads in the second minute and will be monitored by the medics.