On 7 January 2013, Najar moved to Belgian Pro League champions Anderlecht on a one-month loan.
On 30 January 2013, Anderlecht finalised the full transfer of Najar.
The reported transfer fee was $3 million.

He made his debut against Cercle Brugge on 2 August 2013, coming on as 79th-minute substitute.

On 22 October 2014, Najar opened the scoring for Anderlecht in the second half of their Champions League match against Arsenal but two late goals for the English side ensured a 1−2 defeat for the Belgian champions.
On 7 January 2013, Najar moved to Belgian Pro League champions Anderlecht on a one-month loan. On 30 January 2013, Anderlecht finalised the full transfer of Najar. The reported transfer fee was $3 million.
He made his debut against Cercle Brugge on 2 August 2013, coming on as 79th-minute substitute.
On 22 October 2014, Najar opened the scoring for Anderlecht in the second half of their Champions League match against Arsenal but two late goals for the English side ensured a 1−2 defeat for the Belgian champions.
Andy Najar