Danubio F.C.
Born in Montevideo, Gunino made his senior debuts with hometown's Danubio F.C., appearing in four matches during his first campaign, and in further 12 in his second. On 25 July 2009 he was loaned to Boca Juniors, and made his maiden appearance for the club on 3 September, coming on as a first-half substitute in a 1-1 home draw against Newell's Old Boys.