The 21-year-old Frenchman will spend the 2015-16 season with Wanderers, who have an option to buy the versatile defender at the end of that deal.
Neil Lennon’s men will start the season without injured pair Derik Osede and David Wheater, while Tim Ream is also a doubt, so Gouano, who includes Juventus among his former clubs, could make his debut on Saturday in their Sky Bet Championship opener against Derby.
“He’s quick, very quick,” Lennon said of his new recruit.
“He’s played in Holland and he’s played in Portugal and he’s starting to mature a little bit more. That pace is badly needed. He can play left-side central defence so he’ll slot in hopefully very easily and very quickly.
“He’s a strong boy, technically very good, but his pace is his real asset, it gets teams out of trouble.”