Scarlets head coach Wayne Pivac has made nine changes and two positional switches to his side for their upcoming fourth round Champions Cup clash against Glasgow Warriors.
Following a disappointing defeat to the Warriors at Scotstoun last Saturday, Scarlets will be looking to put in a good performance in the second leg of the back-to-back festive fixtures against the Scottish side.
Captain Emyr Phillips is one of four unchanged positions along with scrum-half Gareth Davies, flanker Lewis Rawlins and number eight Morgan Allen.
Full-back Steff Evans moves to the wing with Kiwi Michael Collins coming in at full-back and Gareth Owen moving from inside to outside centre, partnering up with another Kiwi in Hadleigh Parkes.
DTH van der Merwe makes a return to face his former side for the first time since his departure over the summer and Aled Thomas takes the reins at fly half.
Five changes in the pack see the return of Rob Evans, Samson Lee, Jake Ball and Maselino Paulino with 21-year-old Jack Condy getting his first start for the Scarlets.
Meanwhile, Gregor Townsend has made just two changes to his Warriors side this week.
After undergoing an operation on a foot injury hooker Fraser Brown returns to the starting line-up, taking the place of BT Sport Scottish Rugby Academy Stage 3 hooker James Malcolm.
Tommy Seymour starts at full-back for the second time this season, after playing there against Ospreys in November.
Taqele Naiyaravoro retains his place in the team following his hat-trick and Sean Lamont will take his place on the opposite wing, playing against his former club.
In the centre, Mark Bennett and Alex Dunbar combine with Finn Russell and Mike Blair named as the half-back pairing.
In the pack, Alex Allan starts for the first time since October along with Sila Puafisi who plays his sixth game in a row.
Leone Nakarawa and Jonny Gray form the second-row partnership and in the back-row Rob Harley and Simone Favaro both start with Josh Strauss at number eight.
Lee Jones is on the bench fresh from being named Impact Player of the Tournament in Cape Town for the World Rugby Sevens where Scotland won the Bowl, beating England in the Final.
Form: Glasgow Warriors managed to buck the trend and win their first ever match against Scarlets (L4) in the Champions Cup when they won 43-6 in the third round. This will be the Glasgow Warriors' 100th match in the Champions Cup (W32, D2, 65). The Warriors' win over Scarlets in round 3 was their biggest ever win in the Champions Cup, beating their previous best by 10 points (37-10 v Bath in 2014). Glasgow Warriors have averaged more clean breaks (13) and defenders beaten (26) than any other side so far this season.
Scarlets: 15 Mike Collins, 14 Steff Evans, 13 Gareth Owen, 12 Hadleigh Parkes, 11 DTH van der Merwe, 10 Aled Thomas, 9 Gareth Davies, 8 Morgan Allen, 7 Jack Condy, 6 Lewis Rawlins, 5 Maselino Paulino, 4 Jake Ball, 3 Samson Lee, 2 Emyr Phillips (c), 1 Rob Evans.
Replacements: 16 Ken Owens, 17 Wyn Jones, 18 Rhodri Jones, 19 George Earle, 20 Tom Price, 21 Aled Davies, 22 Steven Shingler, 23 Harry Robinson.
Glasgow Warriors: 15 Tommy Seymour, 14 Taqele Naiyaravoro, 13 Mark Bennett, 12 Alex Dunbar, 11 Sean Lamont, 10 Finn Russell, 9 Mike Blair, 8 Josh Strauss, 7 Simone Favaro, 6. Robert Harley, 5 Jonny Gray (c), 4 Leone Nakarawa, 3 Sila Puafisi, 2 Fraser Brown, 1 Alex Allan..
Replacements: 16 Shalva Mamukashvili, 17 Gordon Reid, 18 Zander Fagerson, 19 Tim Swinson, 20 Ryan Wilson, 21 Grayson Hart, 22 Duncan Weir, 23 Lee Jones.
Date: Saturday, December 19
Venue: Parc y Scarlets
Kick-off: 19:45 GMT
Referee: Pascal Gauzère (France)
Assistant Referees: Maxime Chalon (France), Jean-Luc Rebollal (France)
TMO: Bruno Bessot (France)