Coach Steve Hansen has gone out on a limb to be fully fit for Wales' World Cup campaign next month.
The New Zealander went under the knife on Monday as an old rugby injury flared up during the team's pre-Cup warmup in Lanzarote.
"It's an old knee injury which has been playing up for about six months," team manager Alan Phillips said. "It's a cartilage thing - they just went in there and cleaned it up. He was in and out on the same day."
Phillips said there were no serious injuries among the 30-man squad, although there was "plenty of fatigue and the odd ankle strain".
"They really put the work in over there, fair play to them," the former Wales hooker said.
"There are a lot of tired bodies in the team."
Phillips said it was too early to say if all 30 players would take part in a training match at the Millennium Stadium on Wednesday.
GB7s women left their England base to train in Wales this week. Olympic Games hopeful Rachael Burford gives WRU TV's Graeme Gillespie her thoughts on Welsh teammate Jasmine Joyce - a 'one touch wonder'
The GB7s women's squad is currently training at Wales' Centre of Excellence where assistant coach Richie Pugh tells WRU TV's Graeme Gillespie some 'tough calls' will have to be made when it comes to finalising the 12 spots for Rio's Olympic Games.
Wales U20's Billy McBryde is looking forward to starting his first game against New Zealand this afternoon in the World Rugby U20 Championship where his side are looking to gain revenge from last week's pool defeat to the Kiwis.