Gazzaniga joins on a two-year deal, following the expiry of his Tottenham contract last month, keeping him with Fulham until the summer of 2023.
The 29-year-old departed Tottenham with 37 first team appearances to his name.
Speaking to FFCtv, Gazzaniga said: “Fulham is a great club. I love the challenge and I think this is an excellent opportunity for me.
Need a VPN? Or seeking to switch? Then support Tribal Football by clicking here to sign up with our official partners NordVPN. Not only will you receive the best VPN experience, but also great discounts by signing up via Tribal Football. Thanks for your support!