Donatelli was drafted in the third round of the 2006 MLS Supplemental Draft by Houston Dynamo, but was not offered a contract by the team. He signed instead with the Vancouver Whitecaps in the USL First Division, and scored two goals and two assists in twenty-four games played in his debut season. In the 2006 playoffs, Donatelli made a significant impact, scoring three times in four games including a goal in Vancouver's 3–0 win over the Rochester Rhinos in the USL Division OneChampionship game. On June 10, 2008, Donatelli was traded to Montreal Impact for Charles Gbeke. On October 20, 2008 Donatelli accepted a two-year extension deal. During the 2008 season he was loaned for a match to the Impact's farm team Trois-Rivières Attak in the Canadian Soccer League. During the 2009 USL season Donatelli contributed by helping the Impact clinch a playoff spot under new head coach Marc Dos Santos. He recorded his first playoff goal in the quarterfinal match against Charleston Battery in the second match of the aggregate series. The match concluded in a 2–1 victory for the Impact, which resulted in 4–1 victory on aggregate allowing the Impact to advance to the semifinals. He scored his second playoff goal against the Puerto Rico Islanders where match resulted in 2–1 victory for the Impact, and allowing the Impact to advance to the finals by winning their second match on aggregate. Montreal would advance on to the finals where their opponents would end up being the Vancouver Whitecaps FC, thus marking the first time in USL history where the final match would consist of two Canadian clubs. On October 17, 2009 in the second game of finals Donatelli scored the opening goal on a penalty kick in a 3–1 victory, therefore winning the match and claiming Montreal's third USL Championship. Donatelli signed with San Jose Earthquakes on January 28, 2011. He trained with the club for one month before being waived on March 1, 2011, prior to the start of the MLS season. He subsequently signed with USL Pro club Rochester Rhinos on March 18, 2011. Donatelli moved to fellow USL Pro team Charleston Battery on March 27, 2012 and helped the club win the USL Pro League title. After the 2012 outdoor season, Donatelli returned to the indoor game where he signed with the Baltimore Blast of the Major Indoor Soccer League. He would helped them win the 2012/13 MISL title and over the next three years, Donatelli played both indoor and outdoor soccer, before focusing solely on the indoor game starting in the 2015/16 campaign. During his time with the Blast, he helped them win three straight Major Arena Soccer League championships from 2015 - 2018. In 2016, Donatelli earned his first cap with the U.S. Futsal National Team in a 4-4 draw against Canada in the 2016 CONCACAF Futsal Championship.
Honors
;Baltimore Blast
Major Indoor Soccer League Championship: 2012/13
Major Arena Soccer League Championship: 2015/16, 2016/17, 2017/18