Sam Parry (Ospreys) has been called up to the squad.
Scarlets’ duo Ken Owens (back) and Josh Macleod (shoulder), as well as Cardiff Rugby’s Will Davies-King (foot) have been released due to injury.
Since the initial preliminary training squad announcement on 1 May, Alun Wyn Jones, Justin Tipuric and Rhys Webb have all retired from international rugby. Rhys Carre was released and Cory Hill withdrew from the squad as he is unavailable to play during Rugby World Cup.
Gatland said: “We’ve been really pleased with the players’ attitude and commitment throughout the first few weeks of our mini camps.
“The group has worked really hard and there have been a few curve balls from us in terms of testing them mentally and physically as people may have seen in some of our videos.
“Unfortunately we’re having to release Ken, Josh and Will due to injury which is really disappointing, but all three are hoping to be available later in the year should we need an injury replacement at any point.
“Ken has a niggle in his back which he needs some time out to sort. Josh got the injury on club duty – we were hoping to be able to manage it, but specialist assessment showed that wasn’t possible. Will picked up the foot injury in training with us which we were managing but then he got re-injured so has been released.”
After a period of mini camps running a few days a week from 25 May to 21 June the squad has assembled today for three more days training this week at the National Centre of Excellence in Hensol before travelling to Fiesch, Switzerland on Monday 3 July for a two-week training camp.
Gatland added: “We’re looking forward to getting the group back together for a few days further training in Wales before we head to Switzerland.
“We’ve done a lot of good preparation already here in Wales and we are heading to Fiesch where we are looking to get the benefits of sleeping at altitude and will kick our training up another gear.
“Owen Williams and Alex Cuthbert won’t travel to Switzerland for personal reasons, but we are looking for them to attend our training camp in Turkey.
“Taulupe Faletau will travel out to Switzerland for the second week of the training camp as he’s managing a bit of a calf injury and so he can help out at home with his young family following the recent birth of his third child.”
Following the training camp in Switzerland the squad will have a few days off before reconvening for a training camp in Turkey running 23 to 31 July.
Wales then have three Test matches against England (home and away on 5 and 12 August) and South Africa (19 August at Principality Stadium) in the Summer Series, before the official 33-player squad heading to Rugby World Cup 2023 in France is named.
Public sale tickets to watch Wales at Principality Stadium in the Summer Series are available now from WRU.WALES/TICKETS
Updated Wales senior men’s training squad for Rugby World Cup 2023
Forwards (25)
Corey Domachowski (Cardiff Rugby / Caerdydd– uncapped)
Kemsley Mathias (Scarlets – uncapped)
Nicky Smith (Ospreys / Gweilch– 42 caps)
Gareth Thomas (Ospreys /Gweilch – 21 caps)
Elliot Dee (Dragons / Dregiau– 41 caps)
Ryan Elias (Scarlets – 33 caps)
Dewi Lake (Ospreys / Gweilch – 8 caps)
Sam Parry (Ospreys / Gweilch – 5 caps)
Keiron Assiratti (Cardiff Rugby / Caerdydd– uncapped)
Tomas Francis (Ospreys / Gweilch – 71 caps)
Dillon Lewis (Harlequins – 50 caps)
Henry Thomas (Montpellier – uncapped)
Adam Beard (Ospreys / Gweilch– 46 caps)
Ben Carter (Dragons / Dregiau– 9 caps)
Rhys Davies (Ospreys / Gweilch – 2 caps)
Dafydd Jenkins (Exeter Chiefs / Caerwysg – 6 caps)
Will Rowlands (Dragons / Dregiau – 23 caps)
Christ Tshiunza (Exeter Chiefs / Caerwysg – 5 caps)
Teddy Williams (Cardiff Rugby / Caerdydd– uncapped)
Taine Basham (Dragons / Dregiau – 11 caps)
Taulupe Faletau (Cardiff Rugby / Caerdydd – 100 caps)
Dan Lydiate (Dragons / Dregiau – 68 caps)
Jac Morgan (Ospreys / Gweilch – 9 caps)
Tommy Reffell (Leicester Tigers / Caerlŷr– 9 caps)
Aaron Wainwright (Dragons / Dregiau – 37 caps)
Backs (22)
Gareth Davies (Scarlets – 67 caps)
Kieran Hardy (Scarlets – 17 caps)
Tomos Williams (Cardiff Rugby / Caerdydd – 45 caps)
Gareth Anscombe (unattached – 35 caps)
Dan Biggar (Toulon – 107 caps)
Sam Costelow (Scarlets – 2 caps)
Owen Williams (Ospreys / Gweilch – 7 caps)
Mason Grady (Cardiff Rugby / Caerdydd – 2 caps)
Max Llewellyn (Gloucester Rugby / Caerloyw – uncapped)
George North (Ospreys / Gweilch – 113 caps)
Joe Roberts (Scarlets – uncapped)
Nick Tompkins (Saracens – 27 caps)
Johnny Williams (Scarlets – 5 caps)
Keiran Williams (Ospreys / Gweilch – uncapped)
Josh Adams (Cardiff Rugby / Caerdydd – 49 caps)
Alex Cuthbert (Ospreys / Gweilch – 57 caps)
Rio Dyer (Dragons / Dregiau – 7 caps)
Cai Evans (Ospreys/ Gweilch – uncapped)
Leigh Halfpenny (unattached – 99 caps)
Louis Rees-Zammit (Gloucester Rugby / Caerloyw– 25 caps)
Tom Rogers (Scarlets – 2 caps)
Liam Williams (Cardiff Rugby/ Caerdydd – 84 caps)
2023 SUMMER SERIES FIXTURES
Saturday 5 August: Wales v England
Principality Stadium, Cardiff
KO 17.30 BST
Tickets available now from WRU.WALES/TICKETS
CAT A £80, CAT B £60, CAT C £40 Under-17 50% concession available on all tickets
Saturday 12 August: England v Wales
Twickenham Stadium
KO 17.30 BST
Saturday 19 August: Wales v South Africa
Principality Stadium, Cardiff
KO 15.15 BST
Tickets available now from WRU.WALES/TICKETS
CAT A £60, CAT B £40, CAT C £20 Under-17 50% concession available on all tickets
ENDS