Wales have called up four players — including uncapped Ospreys lock Rhys Davies — for the summer Tests against Canada and Argentina.
Davies, Samson Lee, Seb Davies and Lloyd Williams make up the quartet who’ve been summoned.
Head coach Wayne Pivac has acted after being hit by injuries and Lions calls.
Read more: Why Adam Beard was called up for Lions amid Irish anger
Lee replaces Tomas Francis, who has been absent in recent weeks for Exeter Chiefs because of a back injury, while Lloyd Williams is drafted in as cover for Rhodri Williams, who has a shoulder problem and will continue to be assessed.
Seb Davies takes over from Adam Beard, who has been called up for the Lions tour, with Rhys Davies taking the place of Josh Navidi, who has also been parachuted into Warren Gatland's squad for the trip to South Africa.
With Ross Moriarty, Josh Turnbull, Aaron Wainwright, Taine Basham and James Botham in the mix, Wales feel they have enough back-row cover without summoning a direct loose-forward replacement for Navidi. You can see the initial Wales squad that was announced here.
It means there's no place for the highly promising Jac Morgan, who has had an outstanding season for the Scarlets.
Many felt the youngster was unlucky not to be named in Pivac's initial summer squad. His exclusion from the list of replacements, with a lock being picked instead, will further perplex Morgan's admirers.
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That said, Wales' strength in depth is being tested in the second row, with Cory Hill being ruled out of the equation last week as he’s heading abroad to play his rugby, Jake Ball off limits in Australia, Beard away with the Lions and Alun Wyn Jones out injured.
So it’s a call for Rhys Davies, the young lock the Ospreys recruited from Bath last year.
The 6ft 6in, 18st 4lb forward has impressed with his work ethic and strong line-out showings. Given a chance by Toby Booth earlier in the season, he took it with both hands, showing an appetite for defensive work and winning a stack of in-house awards at the Liberty Stadium region.
Evidently, Pivac feels the need to try to develop second rows at Test level, having seen Hill and Ball heading out of his reach.
It is another chance, too, for Seb Davies, a skilful ball handler who has been on the Wales fringes for some time.
The feeling is that while he has a lot to offer, he needs to develop more consistency and show added aggression.
If could deliver on those fronts, he could yet fulfil the considerable promise many believe the 6ft 6in, 18st 3lb Cardiff Blues player has.
Pivac will feel fortunate to be able to call on Lee amid the injury to Francis, because while Dillon Lewis and Leon Brown are recognised as being excellent around the field, both have yet to conclusively show them to be Test class scrummagers.
By contrast, Lee made his name as a reliable set-piece operator.
Staying fit has often been his concern, but when he's injury-free and firing, he has the ability to add significant value.
