"I'm very excited about it. Todd will quality to our side. We've got three class players in the halves competing for two places and this is what the coach wanted."
Carney was sacked by three NRL clubs, Canberra, Sydney Roosters and Cronulla, and was forced to complete a player-welfare program before being allowed to join the Dragons in 2015.
The Catalans also had to agree to a series of conditions and place a STG50,000 ($AU80,000) bond with the RFL before they were able to register him but Koukash says the player has put his troubles behind him.
"I've known Todd for a couple of years," Koukash added. "We all make mistakes, Todd himself has acknowledged he has made mistakes in the past, and he wants to get back to what he can do.
"We had no hesitation signing him. On his day he can be the best player in Super League."
Carney, who is currently involved in a bid to win compensation for his most recent dismissal by Cronulla, has maintained his fitness while preparing for a boxing match with former Warrington half-back Chris Sandow in December.
Salford coach Ian Watson said: "Speaking to Todd over the Christmas period, I know how excited he is to come across and perform for the club. "I told Todd what Salford was about these days - no egos and no favouritism shown and we didn't want people who would damage the team or what we are about. I told him we were interested in signing him if he wanted to buy into our team ethos and prove to the boys that he wanted to play for Salford Red Devils in 2017.
"Todd was very open with us about past misdemeanours and wants to focus on getting his rugby league career back on path and we believe that, if we can get him fully fit and running at teams, that he will be a great asset for us."
- AAP