Cardiff Blues prop Scott Andrews (11 caps) has been called into the training squad and will travel to Doha, Qatar this weekend.
Wales and Scarlets prop Rhodri Jones has been released from Wales' Rugby World Cup Training Squad after suffering a ruptured pectoral muscle. The 23-year-old will undergo surgery on the injury with an expected return to play time between 12 to 16 weeks.
"It is hugely disappointing for Rhodri, who was working extremely hard out in Switzerland. We wish him all the best with his recovery from the injury," said Wales Head Coach Warren Gatland.
"It is a great opportunity for Scott to come into the squad and show us what he is capable of. In terms of the tighthead position, Samson has continued to make excellent progress and we have been very impressed with both Aaron Jarvis and Tomas Francis during the first batch of training."