Slory becomes the second international acquisition for the Reds this week, after originally signing Uruguayan Francisco Usucar.
Reds coach Rini Coolen said he had been tracking the player for quite some time, and can add a lot to his side.
"We were looking for an extra attacker who can play as a winger and bring some speed into the game, also someone with experience and that’s what Slory has,” Coolen said on the club's official website.
"I know him from when he played in Holland, he was playing with one of the best clubs in Holland, Feyenoord, and he also played a few games for the national team."He wasn’t feeling happy, he wants to have fun again, wants to play football and that gave us the opportunity to get him.
Coolen revealed the Suriname-born player wanted to play football with a Dutch coach, as he was a free agent prior to joining the South Australian club.
"He wanted to start working with a Dutch coach again and get a good feeling back that he has lost in the last couple of months.
"He knows the system we play, he can play on both wings, he has spoken to a lot of people about the level of this league and after I spoke with him on the phone, a couple of days later he called me back and said he's happy to come over with his family and give it his best shot," he concluded.
Slory will only be eligible to play after 1 January 2011.