Wales have suffered an injury setback as tighthead prop Rhodri Jones has been ruled out for twelve to sixteen weeks with a ruptured pectoral muscle.
The Scarlets front-row has been released from Wales' Rugby World Cup training squad and the 23-year-old is set to undergo surgery on the issue.
Cardiff Blues tighthead prop Scott Andrews has been called into the training squad and will travel with the squad to Doha, Qatar this weekend.
"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," Wales head coach Warren Gatland told wru.co.uk.
"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."