The head coach insists the crowd can provide the spark his age group youngsters need against France a week after they came so close to beating England.
As his team prepare for their Six Nations showdown, Whiffin has made it clear that the atmosphere could be decisive.
After seeing his players feed off the energy of passionate vocal support against England in a gutsy win last season, Whiffin is hoping for a repeat as they chase an upset.
“The thing we are hoping for most is a similar crowd bringing similar noise to when we last played at Cardiff Arms Park against England. The players drew off the crowd so hopefully we can excite the crowd and get them behind us to energize the performance,” said Whiffin.
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Wales head into the contest as underdogs and have not beaten France at this level since 2020, but their recent displays suggest the gap is narrowing.
Last week they pushed England all the way in Northampton, only to be denied by a late rally that saw the hosts edge ahead for the first time in the 75th minute.
“The boys after the game [against England] were obviously disappointed as they know that was one that got away but by the time we came in on Monday they had managed to recharge at home and were fully refreshed and ready to go for this week,” said Whiffin.
In a season when Welsh rugby at senior level has endured sustained struggles, the Under-20s have offered genuine encouragement.
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Co-captain Deian Gwynne reflected on the character shown in Northampton.
"In a dark time in Welsh rugby we showed so much heart," said Gwynne.
"I'm really proud of the boys for fighting so hard."
Whiffin believes his squad have demonstrated they can stand toe-to-toe with the leading nations in the competition.
“Every game is different in its own right and Saturday will be a different entity but we know we can compete against the bigger teams. We have shown that we are a match for anyone in the competition.
“It will be different challenges on Saturday as France bring different threats than England but we go into every game with winning in our minds.
“We go into every game prepping to win and expect a performance which gives us a chance of doing that.”
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Wales have not lifted the Under-20 Six Nations title since the 2016 Grand Slam-winning campaign under Jason Strange, but last year’s group defeated Italy, Ireland and England to secure a third-place finish.
That upward trajectory has fostered belief within the current squad.
"The team is different every year, so you don't carry previous results as much," said head coach Whiffin, who is overseeing his third Six Nations campaign.
"You start afresh and there is less scar tissue, plus we won three games last year's tournament so the boys know we can compete against the top teams.
"We showed that again last week and I've no doubt it will be the same against France.
"We are in all of these games at age-grade level. The real area that we need to fix is from age 20 to 23 and how we can keep getting experience for those guys."
There has been one enforced alteration to the starting XV. Bath Rugby’s Jack Woods misses out with a hamstring injury sustained against England, prompting a reshuffle that sees Rhys Cummings switch from the wing.
Bristol Bears’ Evan Morris comes in to make his debut out wide. On the bench, Dragons hooker James Talamai replaces Oscar Thomas, while Bath back-rower Alex Ridgway is named in place of Dom Kossuth.
France will present a different examination in terms of power and unpredictability, but Whiffin’s message is clear: his players are ready — and with a passionate Arms Park behind them, they believe they can rise to the occasion.
Wales U20 v France U20 at Cardiff Arms Park, Sat 14 Feb, 8pm
1 George Tuckley (Dragons RFC)
2 Tom Howe (Cardiff Rugby)
3 Jac Pritchard (Scarlets)
4 Luke Evans (Exeter Chiefs)
5 Osian J Williams (Bristol Bears)
6 Osian Williams (Scarlets)
7 Caio James (Gloucester)
8 Deian Gwynne (Gloucester – Co-Capt)
9 Sion Davies (Cardiff Rugby)
10 Carwyn Leggatt-Jones (Scarlets)
11 Tom Bowen (Cardiff Rugby)
12 Steffan Emanuel (Cardiff Rugby – Co-Capt)
13 Osian Darwin-Lewis (Cardiff Rugby)
14 Evan Morris (Bristol Bears)
15 Rhys Cummings (Cardiff Rugby) Replacements:
16 James Talamai (Dragons RFC)
17 Dylan James (Ospreys)
18 Isaac Godfrey (Exeter Chiefs)
19 Tom Cottle (Cardiff Rugby)
20 Evan Minto (Dragons RFC)
21 Alex Ridgway (Bath Rugby)
22 Luca Woodyatt (Gloucester)
23 Lloyd Lucas (Cardiff Rugby)
