And, according to the flanker, the fans' support could be the difference between winning and losing.
He said: "It's a huge game for both teams on Saturday and we need as many fans as possible to come to Sixways.
"Their support is crucial - it helped the side win important matches last season - and it will do the same this season.
"Fans inspire players but we need to inspire them as well. We know it's up to us to give fans something to cheer about and hopefully we can do that on Saturday."
Thomas hasn't missed a minute of action this season and has impressed since his summer arrival from Ospreys.
And the Welshman, who has won 67 caps for his country, says Newcastle Falcons will provide his side with a huge challenge this weekend.
He added: "Newcastle have started the season very well. They've already got one win and have looked strong in all their matches.
"They've got good structures in place up there and will be a match for most teams in the league.
"But they're on our patch on Saturday so we need to raise the level to ensure we get the win we're all looking for.
"The fans and players are in it together and we all want the same thing - we need to get our season started."
Seated tickets in the North Stand and East Stand start from just £24 for adults and £15 for juniors and are available by calling 01905 459309, clicking here or visiting the Box Office.