Wales won their first Grand Slam in 27 years this year but have suffered record defeats to New Zealand and South Africa this month. They even needed a late drop goal to beat lowly Fiji and have scored only two tries in the three games. But Thomas still believes his injury-ravaged team can salvage some pride by beating the Wallabies in Cardiff on Saturday.
"With the way things have gone this Autumn the players realise this is their last chance to put things right," said Thomas. "We wanted to play against these big teams to test ourselves but we feel we are better than this. The only way to move forward is to get a victory - that is more important to us than anything.
"We have dug in and shown improvements from each game but we know we need to cut out the errors that have been costing us so far.
"We're not looking for excuses but we've had a lot of injuries and new combinations this month and our preparation hasn't been ideal. But come Saturday, if we perform well, everything that has gone on before will be forgotten. I'm sure we can win."
The slump in form has seen Wales drop to sixth in the world rankings while Australia regained their place in the top three with an emphatic victory over Ireland in Dublin. That win ended their own miserable run of seven successive defeats while Wales have not beaten the Aussies since 1987.
Thomas added: "Australia have had a tough year but you can never write off a team like the Wallabies. They have been a top three team for the last ten years."
Wales duo Rhun Williams and Liam Belcher, who makes a welcome return after five months of injury woe, look ahead to next month's World Rugby U20 Championship in Manchester where they will face Ireland, Georgia and New Zealand.
Whenever Bedlinog tackle Penallta a massive fixure is guaranteed but this Sunday there will be even more emphasis placed on the two rivals when they contest the SSE Swalec Plate final at Principality Stadium.
Ahead of their SSE SWALEC Bowl Final clash with Taffs Well at Principality Stadium on Sunday, Burry Port share their #FABXV nomination with WRUTV in the search for Welsh rugby's greatest volunteers. Everyone can get involved by sending nominations via twitter to @WRU_Community using the hashtag #FABXV
Cardiff Blues prop Gethin Jenkins and Ospreys centre Ben John look ahead to the first game at Principality Stadium in Saturday's double header which is promising to be a special occasion for all Welsh fans.
Carmarthen Quins Director of Rugby Ian Jones and committee member Jeff Thomas along with Llandovery chairman Handel Davies look ahead to Sunday's SSE SWALEC Cup showdown where both teams are out to prove 'West is best'
SWALEC ambassador Shane WIlliams is looking forward to Sunday's Finals Day where the Cup, Bowl and Plate offers a great opportunity for players and teams to experience the magic of playing at Principality Stadium
Carmarthen Quins coach Richard Kelly believes it is an exciting time to be part of the Scarlets region as his side take on local rivals Llandovery in the SSE Swalec Cup final on Sunday, as WRU TV's Graeme Gillespie discovers