"This is a proud day and a massively exciting opportunity for me. It's an honour just to be an Edinburgh player, so to be named captain is one of the best things that's ever happened to me," said Grant.
"I'm going to work as hard as I possibly can to make a success of the job and to ensure the team has a great season. All the ingredients are there for that to happen."
Born in Botswana to Scottish parents, Grant represented South Africa at water-polo at under 15 and under 16 age groups. But rugby was very much in his blood as both his maternal grandfather and great uncle were international referees.
His great uncle, George Burrell, also played full back for Scotland in the fifties and was manager of the 1977 British & Irish Lions tour to New Zealand. Having played for Scotland at Under 19, Under 20, A and Sevens levels, Grant is setting his sights on becoming the family's lat4est full international.
"Everything we've seen from Roddy since he came into the Edinburgh fold has shown him to be a mature and confident rugby player who can handle anything that's thrown at him," said Edinburgh coach Rob Moffat.
"He has the respect of his coaches and his teammates and performed well when we made him captain for those games last season. He will have the full support of an experienced group of players, and I'm absolutely convinced he'll seize what is a fantastic opportunity for him. He sets high standards for himself, and he'll set high standards for those around him."