Former Scarlets and Wales back-rower Rob McCusker's Ospreys stay is extended until the end of the 2018-19 season.
Lock Rory Thornton says he is "champing at the bit" ahead of winning his first Wales cap against Samoa.
Wales drop Scott Williams for Friday's match against Samoa, while tour coach Robin McBryde names one new cap in Rory Thornton.
Centre Kieron Fonotia warns his Samoa team-mates that Ospreys colleague Sam Davies is Wales' chief threat ahead of their Test in Apia.
Audio & Video
Defence coach Shaun Edwards assesses the prospects of new Wales cap Rory Thornton and young centre Tyler Morgan against Samoa.
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