In addition to playing collegiate soccer, Valentino spent the 2007 season with the San Jose Frogs of the USL Premier Development League.

He made his full professional debut for Revolution on July 1, 2008, in a US Open Cup third-round game against Richmond Kickers,[1] and was traded to Colorado Rapids in exchange for Nico Colaluca on May 6, 2009.

He later signed with new USL Pro franchise Orlando City on March 31, 2011;[4] he scored his first career goal on April 16, 2011, in a 1–0 victory over the Charlotte Eagles.

The USL club is owned by Orlando City SC and reunited Valentino with his former teammate Anthony Pulis who was the team's head coach.

[7] In 2019 he was added to Frank De Boer's technical staff as an assistant manager to the 2018 MLS Cup-winning team Atlanta United FC.