Thomas, 22, is working his may back to full fitness after suffering a broken nose and a fracture of the ischiopubic bone in the groin.
The Beijing Olympics track gold medallist currently rides for Team Barloworld, but is tipped to join the new British-based Team Sky next year.
Cooke, the Olympic road race champion, competes for her own Vision 1 Racing team.
Both Welsh riders will be on home soil this weekend in the GB National Road Race Championships, which take place in Abergavenny in south Wales, where Cooke will be defending her title.
The competition will have a top-class field, with the likes of Mark Cavendish, Bradley Wiggins, David Millar, Emma Pooley and Lizzie Armitstead all expected to compete.
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