And the Warriors skipper put his side's loss down to a poor start.
He said: "We spoke all week about starting well and taking the game to Newcastle but we failed to do that early on and that cost us the game.
"It is a similar feeling to the London Irish game where we dominated and created enough chances to win.
"Today we've gone 13-3 down and in the Premiership if you give a side a cushion like that, it's always hard to come back from."
Warriors picked up a losing bonus point but are still searching for their first win of the campaign.
And despite a tough start, Thomas pin-pointed where his side need to go from here.
He stated: "I'm sure there will be people at this stage of the season that will be writing us off because of where we are in the table.
"But confidence is a big thing in sport. We just need to stay tight and constantly work hard, improve, and simply believe that we can get ourselves out of this position.
"We are relatively new as a group but in nearly every game we've played, we have performed well in patches but silly errors and lapses of intensity in moments of the game have killed us.
"At this level, we have to play 80 minutes intense error-free rugby week-in week-out."
The forward believes that his side have the strength and depth to start picking up results in the Aviva Premiership and praised the work of the Warriors coaching staff.
"We've got enough good players in this squad to get us out of this hole and we have some more guys returning from injuries and the Argentinian boys joining next week.
"The coaches simply can't do any more for us. They have been outstanding with the environment that they are creating and the training they are doing with us - we just have to look at ourselves.
The Warriors captain also asked fans to stick by the team and insisted that the players are doing their utmost to turn their situation around.
He concluded: "The fans were outstanding today. Every time we pull on that shirt we want to do well for them and we're gutted that we aren't able to give them something more to cheer about.
"But we desperately need them to keep the faith and we are confident we can turn this around and give them something to smile about in the near future."