Four players returned to the Wales set-up, when coach Warren Gatland named the 39-man squad which will meet at the WRU National Centre of Excellence on Monday.
It is the start of preparations for the World Cup-warm up clash with England at Twickenham next weekend.
Gatland and his coaching team will select the match-day 22 from this squad and announce the side for the first of three WC-warm up matches on Thursday, August 4.
Wales face England at Twickenham next Saturday, August 6, before hosting the old enemy in the return fixture at the Millennium Stadium seven days later.
Argentina provide the final opposition on home soil on Saturday 20 August, before a 30-man Wales squad for the 2011 WC in New Zealand is named two days later.
Ospreys flank Jonathan Thomas, Sale Sharks back row Andy Powell, Blues prop Scott Andrews and Scarlets hooker Ken Owens - who all took part in Wales' first pre-WC training camp in Poland, but not the second - have all returned to put themselves in contention for selection against England.
The rest of the 35-man squad, which made the second trip to Poland, including Melbourne Rebels flank Gareth Delve who joined up late, have all been retained - with the exception of Rob McCusker who has struggled with back problems.
Gatland and his coaches will name the side to face England, based on this squad, but players who remain outside of it may still be involved in future warm-up matches and could still be a part of the 2011 WC campaign.
"The team to face England at Twickenham will be selected from this training squad," said Gatland.
"We have established a nucleus of players who will form our WC squad based on their performances in training over recent weeks, but it is now time to translate those efforts onto the field. The players have worked hard, but places in that final world cup squad are still very much up for grabs and a lot will depend on what we see over the course of these next three games.
"We have not shied away from facing the top quality opposition in preparation for this world cup and it doesn't come much tougher than facing the 2003 World Cup winners and 2007 finalists on their home patch. The warm-up fixtures will be tough, but we are in a really tough group at the world cup and replicating those conditions can, ultimately, only be of benefit to us."
Wales squad: Scott Andrews, Gethin Jenkins (Blues), Lloyd Burns (Dragons), Huw Bennett, Ryan Bevington, Adam Jones, Paul James (Ospreys), Ken Owens, Matthew Rees (Scarlets), Craig Mitchell (Exeter Chiefs), Bradley Davies, Sam Warburton, Martyn Williams (Blues), Luke Charteris, Danny Lydiate, Toby Faletau (Dragons), Ryan Jones, Alun Wyn Jones, Jonathan Thomas, Justin Tipuric (Ospreys), Josh Turnbull, (Scarlets), Gareth Delve (Melbourne Rebels), Andy Powell (Sale Sharks), Michael Phillips (Bayonne), Lloyd Williams (Blues), Tavis Knoyle (Scarlets), Jamie Roberts (Blues), James Hook (Perpignan) Jonathan Davies, Stephen Jones, Rhys Priestland, Scott Williams (Scarlets) Gavin Henson (unattached), Leigh Halfpenny (Blues), Lee Byrne (Clermont Auvergne), Aled Brew (Dragons), Shane Williams (Ospreys), George North, Morgan Stoddart (Scarlets).
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