Wales full-back Liam Williams has returned from a head injury for Cardiff's final Challenge Cup pool game against Brive in France.Cardiff have already secured both qualification and a home tie in the last 16 of this competition but a victory will see them finishing top.Warren Gatland will undoubtedly be keeping a close eye on proceedings given five of his squad for the Six Nations are in action.Scrum-half Tomos Williams captains the side while Mason Grady, Rhys Carre, and Teddy Williams have also been selected to start.The game was originally due to be played at 21:00 local time (20:00 GMT), but will kick off almost five hours earlier at 16:15 (15:15 GMT), due to icy conditions in France.Brive: Mathis Ferte; Arthur Bonneval, Setariki Tuicuvu, Setareki Bituniyata, Kevin Fabien; Nicolas Sanchez, Enzo Sanga; Wesley Tapueluelu, Motu Matu'u, Francisco Coria Marchetti, Julien Delannoy, Lucas Paulos, Tevita Ratuva, Said Hireche (capt), Retief Marais. Replacements: Nathan Fraissenon, Daniel Brennan, Tietie Tuimauga, Oskar Rixen, Sasha Gue, Leo Garbonneau, Enzo Herve, Wesley Douglas.Cardiff: Liam Williams; Aled Summerhill, Mason Grady, Ben Thomas, Jason Harries; Rhys Priestland, Tomos Williams (capt); Rhys Carré, Kirby Myhill, Keiron Assiratti, Lopeti Timani, Teddy Williams, James Botham, Ellis Jenkins, James Ratti. Replacements: Efan Daniel, Brad Thyer, Will Davies-King, Rory Thornton, Seb Davies, Shane Lewis-Hughes, Lloyd Williams, Jarrod EvansReferee: Anthony Woodthorpe (England)