Full-back Davies picked up a knee injury in the 20-16 defeat to the Blues on Wednesday while Thomas is out of the reckoning with back trouble. The match at the Racecourse Ground in Wrexham will be the Scarlets' third outing in eight days but director of rugby Gareth Jenkins believes his squad will be able to cope.
"We've been able to balance our selection so hopefully we won't be affected too much by the injuries," he said. "We've taken a few casualties and that might pressurise our selection, but we knew this was in front of us and we were quite clear about what this week meant."
Connacht beat the Blues at home in their first game of the season, but will arrive in North Wales on the back of a 34-3 defeat to Edinburgh Gunners.
"They'll be resilient and tough, and will make life really awkward for us," added Jenkins. "They will probably be fresh and they are always capable of tripping sides up."
Wales head coach Warren Gatland and captain Sam Warburton say their first prioirty on Sunday in the opening game of the World Cup is to win against Uruguay and not get overly concerned with points difference.
With only days to go until the biggest rugby competition in the world begins, rugby fans visiting Cardiff this autumn will be able to enjoy a special display at National Museum Cardiff as part of the celebrations surrounding the Rugby World Cup.
Geraint John has taken up the new role of WRU elite coach development manager having arrived in Wales last week. WRU TV caught up with him at the WRU rugby department's strategy day at the Millennium Stadium.
The entire Welsh Rugby Union Rugby Department gathered at the Millennium Stadium earlier this week where WRU Head of Rugby Josh Lewsey looked back on a year where structural and strategic changes have seen significant progress made
The Welsh Rugby Union has released a specially produced video to spearhead a new campaign to help promote the values of rugby union. The video, entitled Let us Play underpins the WRU rugby department's philosophy - to engage, transfer and retain players, coaches and referees.