Exeter Chiefs forward Tomas Francis, who has 26 caps for Wales, has been included in a 39-man squad named by Welsh head coach Warren Gatland.
The talented tight-head is one of seven players from the Aviva Premiership who will convene at the National Centre of Excellence on Monday.
Wales head coach Warren Gatland said: "We have selected a larger squad and it is an opportunity for us to work with a wider group and continue building for the next 18 months. It's important to have a group of players who are used to the environment, know what is expected and are familiar with things and that will really benefit us going forward.
"We have included a couple of players who are carrying injuries. With Taulupe we are hoping he will be available towards the end of the campaign and Rhys (Priestland) picked up a knock at the weekend so we will see where he is at. It's useful to have these experienced guys around camp and to have them included and to work with them.
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