Danielli was in the provisional Scotland squad for this year's RBS 6 Nations but has not featured in either of their opening
two matches.
He said: "I am really excited and honoured to be joining Ulster, the fans are terrific and the atmosphere at Ravenhill is one of the best I've ever experienced.
"I'm looking forward to playing in a team with so many world-class players and such strong ambitions."
Ulster Coach Mark McCall added: "We are very pleased to be able to sign a player of Simon's quality and proven pedigree."







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