The Scarlets can still quality for the Pro14 play-offs next week after beating the Dragons, but they need Connacht to do them a favour.
Leinster picked up where they left off in the Pro14 as they held off Munster in a thrilling contest in Dublin on Saturday.
Scarlets have confirmed Wales flanker James Davies will miss the rest of the season as he requires hip surgery.
Matthew J Watkins won 18 caps for Wales in the 2000s, before battling cancer, and his death left his former clubs "deeply saddened".
Southern Kings and Benetton Treviso both fell short on Welsh soil as Scarlets and Cardiff Blues earned Pro14 wins.
With Brad Mooar heading off to be part of New Zealand's coaching staff, Glenn Delaney will take over as head coach of the Scarlets.
Ulster maintained their unbeaten home record in the Pro14 with an emphatic win over Munster, who slipped off the top of Conference B.
Leigh Halfpenny is out of contract at the end of the season, but Scarlets have no intention of letting the Wales international leave.
It was a miserable Boxing Day for the Ospreys, as they were hammered by the Scarlets, while Cardiff Blues won the other Welsh derby.
Liam Williams will return to Pro14 side Scarlets next season after his contract with Premiership champions Saracens comes to an end.
Ian Foster's New Zealand coaching staff has been finalised with the appointment of Scarlets boss Brad Mooar, who will head home in June.
Reports have claimed Liam Williams will leave Saracens to rejoin Scarlets, and the Wales full-back seems to have confirmed the move.
Brad Mooar's stay in Wales could be short, as Ian Foster wants the Scarlets boss to join his coaching staff.
Eroni Sau's try proved decisive as Edinburgh saw off Pro14 Group B leaders Munster, while Ulster thrashed Scarlets on Friday.
Jonathan Davies is expected to be out for at least six months due to a knee injury, meaning he will miss the 2020 Six... Read more
Scarlets made it three from three in Pro14 on Sunday as Glasgow Warriors earned a first win of the season.