Wales back-row forward Taine Plumtree is set to miss the start of the season after a summer shoulder operation, but should be back before the Nations Championship.
The 26-year-old is targeting the double-header in South Africa against Stormers on Saturday, 24 October and Bulls seven days later.
Scarlets have four fixtures before that tour with URC fixtures against Cardiff, Dragons and Benetton along with a Challenge Cup opener against Newcastle Red Bulls.
Centre Johnny Williams also had summer shoulder surgery and is set for an October return along with fly-half Carwyn Leggatt-Jones, who suffered a quad injury at the World Rugby U20 Championship.
The teenager will back up the Wales pair of Sam Costelow and Gareth Anscombe this season, but fellow promising playmaker Elis Price is likely to miss 2026-27 after surgery on ruptured knee ligaments.
Scarlets, who have confirmed that Wales flanker Josh Macleod will continue as club captain for a fourth season, play the first of three friendlies against Exeter at Sandy Park on Saturday (15:00 BST).
They host Dragons in Llandovery on Friday, 11 September (19:00 BST) and welcome Saracens to Llanelli on Friday, 18 September (19:30 BST).
Davies’ side start the URC with a home derby against Cardiff on Saturday, 26 September (19:45 BST).
