Najar signed a professional Generation Adidas contract with D.C. United on 22 March 2010.
Once part of MLS, the league and his team became responsible for his education.
He was the second player to sign with the first team directly from United's Academy, after goalkeeper Bill Hamid who signed with the first team in September 2009.

Najar made his professional debut on 27 March 2010, in DC's opening game of the 2010 MLS season against the Kansas City Wizards, and scored his first professional goal on 28 April 2010 in a US Open Cup game against FC Dallas.
Najar was voted MLS Rookie of the Year for the 2010 season, ahead of Tim Ream and Danny Mwanga.

Najar was considered by pundits such as Soccer America's Paul Gardner to be one of DC United top players already, at the young age of 17.
He received interest from European clubs, according to his agent, and was expected to move his services there later in his career, possibly as soon as the end of the 2010 season.
However, it was announced in December 2010 that Najar had signed a multi-year contract with D.C. United.

Najar was the only player from the D.C. United's Academy to be called up to compete in the 2012 Olympics.
Najar signed a professional Generation Adidas contract with D.C. United on 22 March 2010. Once part of MLS, the league and his team became responsible for his education. He was the second player to sign with the first team directly from United's Academy, after goalkeeper Bill Hamid who signed with the first team in September 2009. 
Najar made his professional debut on 27 March 2010, in DC's opening game of the 2010 MLS season against the Kansas City Wizards, and scored his first professional goal on 28 April 2010 in a US Open Cup game against FC Dallas. Najar was voted MLS Rookie of the Year for the 2010 season, ahead of Tim Ream and Danny Mwanga.
Najar was considered by pundits such as Soccer America's Paul Gardner to be one of DC United top players already, at the young age of 17. He received interest from European clubs, according to his agent, and was expected to move his services there later in his career, possibly as soon as the end of the 2010 season. However, it was announced in December 2010 that Najar had signed a multi-year contract with D.C. United.
Najar was the only player from the D.C. United's Academy to be called up to compete in the 2012 Olympics.
Andy Najar