Prop Ivan Soroka injured his foot in a club game at the weekend and is awaiting a scan to determine the extent of the injury.
Quinn Roux (hip) will integrate fully into training this week and is available for selection.
Andrew Browne (hamstring) returned to play last weekend against Zebre and played 40 minutes with no ill effects.
Jake Heenan (hand) has recovered from the injury he sustained in pre-season and is available for selection.
Scarlets v Connacht
At Parc y Scarlets, 7.35pm.
Live on S4C/TG4
Referee: George Clancy (IRFU, 83rd competition game)
Assistant Referees: Keith Allen (SRU), Leighton Hodges (WRU)
Citing Commissioner: Ray Wilton (WRU)
TMO: Jim Yuille (SRU)