Philippe Troussier
On 12 July 2012, Guaita signed a half-year deal with China League One side Shenzhen Ruby by manager Philippe Troussier. He made his League One debut on 21 July in a 1–0 home win against Tianjin Songjiang, coming on as a substitute for Takashi Rakuyama by the end of the match. Mainly used as a substitute by Shenzhen Ruby, Guaita made 11 appearances in 2012 season and scored a goal. He was released by Shenzhen at the end of the season.