Dan Biggar fears a "huge step backwards" if there are no crowds allowed at matches moving into 2022.
While crowds at sporting events have yet to be capped in England, matches in Wales and Scotland are now limited when it comes to capacity, amid a sharp rise in coronavirus cases.
Wales' first minister Mark Drakeford has not put any timescale on when the restrictions will be lifted, with the Six Nations set to start on February 5.
Scotland will formally review their measures on January 11, while France – where over 18,000 people were in hospital with COVID-19 as of December 30 – has imposed restrictions on travellers from the United Kingdom, with their government insisting that all sportspeople must be fully vaccinated by mid-January in order to enter the country.
Italy, likewise, is experiencing unprecedented levels of new recorded cases of the virus as the Omicron variant spreads across Europe.
But Wales fly-half Biggar believes banning spectators would be a frustrating move that will only damage the game.
"It would be a huge, huge step backwards if there are no crowds moving forwards for clubs and the Six Nations which is obviously such a showpiece event," he told reporters.
"You saw it in the autumn, getting crowds back. Everyone coming to games now has to have a passport, they'll be double or triple-jabbed, and it's an outdoor event so I don't see why they wouldn't be allowed in.
"As long as it's safe, that's the most important thing.
"I hope for an event like the Six Nations and for the game up and down the UK moving forward we get some sort of sensible outcome.
"As long as everyone is safe and jabbed then I think it makes sense to keep crowds in. I think you would have seen a different [Northampton against Harlequins] game if the stadium had been completely empty.
"We played a lot of games with no crowds but if you look at the first handful of games they almost felt like training games.
"It felt like it did not really matter whether you won or lost because it felt like a training match and like the intensity was knocked out of it. You lose any advantage of playing at home and bits and pieces like that.
"I think it would be a huge step backwards if crowds were to go. I think the rest of the lads in Wales are pretty frustrated with it. That's normal frustration isn't it?
"We are probably getting into different things with politics now but I think everything should be aligned."
Wales, the defending Six Nations champions, start their campaign against Ireland on February 5, with their first home game scheduled for February 12, against Scotland.
Gatland 'still the best coach in the world', says Wales assistant Howley
Wales assistant Rob Howley described Warren Gatland as the "world's best coach" and insists the under-fire boss is going nowhere.
Wales have lost each of their last 11 Test matches, their longest ever run in men’s rugby, overtaking a 10-game stretch between November 2002 and August 2003.
Their most recent defeat came by 32 points (20-52 v Australia), their heaviest loss since a 36-point thrashing at home to South Africa in August last year (16-52).
And it is not going to get any easier with world champions South Africa the visitors to the Principality Stadium on Saturday for Wales' Autumn Nations Series finale.
South Africa have emerged victorious in six of their last seven Tests against Wales (L1) and have also won each of their last three games against Wales by margins of 16+ points.
Another triumph would see Wales going the calendar year without winning a Test, which has not happened since 1937, though Howley has no doubt that Wales are in safe hands.
"We've got the best coach in the world who has had a legacy of more than 13 years," said Howley.
"He's won Grand Slams and there is no better coach to have in your camp than Warren. He gives players the confidence and self-belief they need to go out and play."
During Gatland's first stint in charge from 2008 to 2019, Wales were World Cup semi-finalists, Six Nations champions and Grand Slam winners.
This time around, amid far more challenging circumstances and attempting to mould a new squad, Wales have won just six out of his 23 Tests at the helm.
Wales have also won just one of their last 11 Test matches at the Principality Stadium, last winning in Cardiff against Argentina in November 2023.
Howley was asked if he would take an interim head coach job if Gatland departed, but responded defiantly by saying, "Warren Gatland won't leave".
Howley insists Gatland's experiences can help turn Wales around, saying: "Warren is a hugely respected coach and has coached over a number of years.
"His legacy with different teams is a winning legacy. At the moment, we are in this spell where we are losing.
"We at some point know we will win, and I hope it will be the next game on Saturday. I think at the moment we've got the best coach who has got years of experience.
"We've been in changing rooms where we've won and lost, Lions changing rooms going into the series at 1-1 with everything on the line.
"He understands rugby, and I believe Wales have got the best coach in the world to get us out of this."
Farrell backs 'composed' Prendergast to shine on first Ireland start
Andy Farrell believes Sam Prendergast is ready to step up ahead of his first Ireland start against Fiji at the Aviva Stadium on Saturday.
Farrell has made seven changes to his team, handing first caps to Leinster's Gus McCarthy and Ulster's Cormac Izuchukwu for the penultimate game of the Autumn Nations Series.
The Ireland head coach has handed Prendergast the number 10 jersey for the first time after he was used off the bench in the closing stages of last week's win over Argentina.
Prendergast has only started eight games for Leinster, but Farrell had no hesitation in handing him a first start after he impressed on the Emerging Ireland tour of South Africa.
"I'm confident from what we've seen. We took him on the Emerging [Ireland] and he played in all of those games," said Farrell.
"The aim of that was to grab hold of that team and make sure that he treated it like it was his own, as though he was in charge, and he did that in spades.
"This week we've seen the benefit of that, but we need to see it transfer, obviously.
"Yes, his character is composed, confident but yet not over-confident. He's assertive in what he wants, and he has a nice way about how he goes about his business.”
Farrell also had a glowing review for Izuchukwu, saying: "Izzy has been in and around the squad for a while. The first Emerging Ireland tour was when we first came across his ability, his athleticism, his point of difference.
"That was a couple of years ago but the improvement in his maturity of his game, because he was young in the 15-a-side game when the first tour was on, but the difference between the first and second tour was like chalk and cheese.
"His ability and potential with that maturity, he deserves a shot to show us all what he's got."
On McCarthy, who captained the Ireland Under-20s to a Six Nations Grand Slam in 2023, Farrell said: "He's been a captain and you can see why because his maturity in how he goes about the game."
He added: "We took him on the training week [to Portugal] as a development player and he showed up unbelievably well. He forced our hand to keep him in the squad first and foremost and he deserves a shot to see what he can do as well."
Ciaran Frawley also returns to the bench after missing out last weekend on the back of a poor outing against New Zealand.
And Cian Healy must wait another week for a record-breaking 134th cap - having drawn level with Brian O'Driscoll against Argentina - after the prop was left out of the 23.
Ireland team to play Fiji
Jamie Osborne; Mack Hansen, Robbie Henshaw, Bundee Aki, Jacob Stockdale; Sam Prendergast, Craig Casey; Andrew Porter, Gus McCarthy, Finlay Bealham; Joe McCarthy, Tadhg Beirne; Cormac Izuchukwu, Josh van der Flier, Caelan Doris (capt).
Replacements: Rob Herring, Tom O'Toole, Thomas Clarkson, Iain Henderson, Cian Prendergast, Conor Murray, Ciaran Frawley, Stuart McCloskey.
'World-class' Scotland will provide Wallabies' sternest test – Skelton
Australia will face their sternest test to date when they continue their autumn tour against a "world-class" Scotland team at Murrayfield on Sunday.
That is the view of forward Will Skelton, who believes the Wallabies' victories in England and Wales have brought a new energy and confidence to their camp.
Having crashed out in the pool stage at last year's World Cup in France before finishing last in the Rugby Championship, Australia have looked a team reborn in recent weeks.
A first victory at Twickenham since 2015 and a 52-20 rout of Wales – their biggest-ever away win in matches between the teams – have made it an excellent tour to date for Joe Schmidt's side.
But La Rochelle lock Skelton feels their toughest assignment is to come this week, saying: "We've won two games, we're very aware of that.
"The Test against Scotland is going to be the hardest one yet. We're excited about this weekend and we're looking forward to ripping into it.
"Physically they're up there with the top five in the world. I think set-piece wise they're really strong.
"You've got a guy like Finn Russell who's a maestro at the back there. I think it's going be a close one and we'll be up for it.
"There's some class players in the Scottish team and, when they're at it they're world-class, so we're going to have to be on top of our game."
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