Chico began the 2006 season pitching for Lancaster of the high Class A California League, where he accrued a 3–4 record and a 3.75 ERA in 10 starts.

After joining the Nationals organization, Chico pitched for the Harrisburg Senators of the Class AA Eastern League, winning 2 and losing none of his first 4 starts and compiling a 3.27 ERA.

Chico got off to a rocky start, on a cold and bitterly windy night, walking the bases loaded in the first inning, but escaping unscathed.

[1] During his next start, at Florida on April 21, 2007, in the bottom of the first inning, Chico attempted to throw a changeup to Josh Willingham.

After he pitched only one game for Columbus, an MRI examination in early June revealed loose bodies in his throwing elbow.

He returned to the major leagues on May 8, 2010, when he tossed five-plus innings and allowed two earned runs to the Florida Marlins at Nationals Park while giving up six hits, striking out three and walking none but did not get a decision.

He was designated for assignment again on December 21, he cleared waivers and was sent outright to Triple-A Syracuse Chiefs the next day.