Veteran Welsh international flanker Gavin Thomas signed for the Dragons on Tuesday after an injury-plagued season saw him released by the Scarlets.
The 31-year-old - capped 22 times - signed a one year contract as the Dragons have lost Richard Parks to retirement while the highly-experienced former Welsh captain Colin Charvis is also expected to call it a day.
Another backrow forward Jamie Ringer has also left the club.
"I have known Gavin for some time, I'm delighted to secure his services," said Dragons coach Paul Turner.
"He has a proven track record and with 22 Welsh caps has a wealth of experience which he can bring to the back row... (he) adds more strength to our squad."
Thomas, who won the last of his caps in 2007 but spent 26 weeks of last season on the sidelines because of an Achilles tendon injury, had been with the Scarlets since 2004 after spells with Bridgend, Bath and the Ospreys.
"I am delighted to be joining the Dragons after being out for most of last season," said Thomas.
"It's great that the Dragons have shown confidence in me and I am looking forward to repaying them by performing on the pitch this season.
"There are already some excellent players in the back row and I aim to battle my way into gaining a starting place in the side and contributing to the overall development and success of the team."
