Neither Hopson nor his agent, Al Ebanks, disclosed the terms of the one-year deal, which was made official on Tuesday.
"This deal gives me an opportunity to jump-start my career in a great place,'' said Hopson, who has been working out in New Jersey since not being selected in the NBA draft.
"I've been working out two or three times every day, just focusing on defensive intensity and always being around the ball.''
Hopson said he has not given up on his goal to play in the NBA, but once the NBA summer leagues were canceled and the league continued its lockout, European basketball offered the former All-SEC shooting guard the best option.
"I've had a few offers over the past month, but I wanted to wait for the right one,'' said Hopson, whose agent said he also had offers in Italy, Hungary and Siberia. "I've been getting feedback from my agent and other guys who have played overseas, as far as what would be good for me.''
Greece's Kolossos Rhodes club has been in existence since 1963 but didn't move up to the Greek A-1 League until 2006.
The team plays in 1,300-seat Venetoklio Indoor Hall in Rhodes, Greece, a tourist-driven city of approximately 80,000 on the Aegean Sea coastline.
"I treat every game the same, regardless of where it's at or who it's against,'' Hopson said. "It's about honoring the game and doing everything with two hands, showing tenacity.''
Hopson said he has been focused on getting ready for his professional career the past month, but he also has kept up with the goings on at the University of Tennessee.
"It's great me and Coach (Bruce) Pearl are jump-starting our careers on the same day,'' said Hopson, referring to Pearl's new deal as vice president of marketing for H.T. Hackney of Knoxville. "The news on Coach (Pat) Summitt was tough; Tyler (Summitt) was my roommate, so I reached out to him immediately to let him know their family is in my prayers.
"I've always admired Coach Summitt; there were a lot of times I'd go over and sit in on her practices, just to watch how she conducts herself.''
Hopson said there have been times he has wondered how things would have gone had he stayed at Tennessee for his senior season.
"I've missed Tennessee and my teammates,'' Hopson said. "There was nothing like playing in front of 22,000 fans that were there for me with every step I took. It was hard to give it up, because those fans were always great to me.
"I'm a Vol for life, so I'll be staying in touch and watching every game I can on TV.''
Mike Griffith covers Tennessee men's basketball. Follow him at http://twitter.com/MikeGriffith32