Connacht are set to be without Ray Ofisa Treviranus for their mammoth Amlin Challenge Cup semi-final against Toulon on Friday.
The Samoan flanker was replaced in the 50th minute after suffering a recurrence of vertigo in the nine-try rout by Magners League basement rivals the Scarlets.
And Connacht head coach Michael Bradley confirmed he expects to be without his back-rower for the last four tie in Galway.
Bradley said: "Ray is now a big doubt for next week. He had his some vertigo and we thought we would risk him today. But he doesn't seem to be okay at all."
The Irish province were on the end of a hiding by the time Treviranus departed the field in west Wales.
The Scarlets were intent on not finishing bottom of the league this season and surged into a 31-3 half-time lead with tighthead prop Rhys Thomas crashing over for two tries.
In between the Wales front-row's rare exploits, Jonathan Davies and Rob McCusker touched down for a comprehensive bonus-point before the floodgates opened after the interval to make the final score 58-10
Eoin Griffin scored a consolation for Connacht but Nigel Davies' continued to ram home their advantage with tries from Josh Turnbull, a double for Regan King, a second from centre Davies and Sean Lamont to leave Bradley despondent.
He added: "We are disappointed with the result and the scoreline. But we have to recognise we didn't have our strongest side over here.
But we needed to be stronger in defence. The first three tries were soft and came through the middle.
"We were very disappointed with that because defence was one of the key objectives for us at the start of the game.
"We were left to chase the game against a Scarlets side who are in good form and it was always going to be difficult.
"We have had tough games against Munster and Leinster in recent weeks and it was always going to take its toll. But we are over this period now and can focus on Toulon.
"The tickets are nearly sold out for the Sportsground on Friday. It's fantastic that we have such a high-profile side coming to Galway and it will be a big day for us."
As part of the build-up to next month's Cardiff 2014 Heineken Cup and Amlin Challenge Cup finals weekend, ERC has joined forces with the WRU, Cardiff Blues and adidas to develop an annual grassroots community rugby programme targeting young players.
The Ulster Rugby full back, Jared Payne (No 15), has been suspended for two (2) weeks following an independent Disciplinary Hearing in Dublin arising from the Heineken Cup quarter-final match against Saracens at Ravenhill Stadium on Saturday, 5 April.