Wales international Taulupe Faletau and Samoa scrum-half Kahn Fotuali'i are set to make their debut for their newly joined English Premiership club Bath on Saturday.
After starting their pre-season with a victory over Yorkshire Carnegie, Bath will now take on Scarlets at Eirias Park for their second game. Guy Mercer will lead the side which has Jonathan Joseph, Rhys Priestland and Matt Banahan in the XV while England duo of George Ford and Anthony Watson will be on the bench.
Charlie Ewels and Dave Attwood will start in the second row with Luke Charteris among the replacements.
Meanwhile, Wales internationals Liam Williams, Scott Williams, Gareth Davies and skipper Ken Owens will feature for Scarlets.
Bath XV : 15 Tom Homer, 14 Jeff Williams, 13 Jonathan Joseph, 12 Max Clark, 11 Matt Banahan, 10 Rhys Priestland, 9 Kahn Fotuali'i, 1 Nick Auterac, 2 Tom Dunn, 3 Henry Thomas, 4 Dave Attwood, 5 Charlie Ewels, 6 David Denton, 7 Guy Mercer (c), 8 Taulupe Faletau
Replacements: 16 Ross Batty, 17 Nathan Catt, 18 Kane Palma-Newport, 19 Luke Charteris, 20 Matt Garvey, 21 Tom Ellis, 22 David Sisi, 23 Will Homer, 24 George Ford, 25 Dan Bowden, 26 Anthony Watson, 27 Harry Davies
Scarlets XV: L Williams; R Smith, S Williams, H Parkers, S Evans; R Patchell, G Davies; W Jones, K Owens (c), W Kruger, L Rawlins, D Burbring, A Shingler, M Allen, J Barclay
Replacements: E Phillips, R Elias, P Edwards, W Tayor, R Bernardo, W Boyde, J Macleod, A Davies, J Evans, D Jones, A Thomas, S Hughes, B McBryde, I Nicholas