The 31 year old has previously played with WBA in the Premier League and he strated last season with Watford before suffereing a cruciate knee injury.
After regaing fitness he played back in Romania but has left Steaua Bucharest and is now a free agent.
He has 65 international caps.
Russell Slade has given Tamas a chance to impress.
He has a past thought. Wales Online reports that in 2011, Tamas and former Chelsea star Adrian Mutu were banned from the Romanian team for life after a late night drinking session before a friendly with San Marino.
In the end, their ban was lifted after just three games but Tamas was again dropped from the national side in 2013 after he was pictured smashing his way into a Bucharest apartment block before being led away by police.