Don Balon reports that Martinez is keen to sign the youngster in the January transfer window.
Munir is currently behind the likes of Luis Suarez and Lionel Messi in the pecking order at the Camp Nou.
The 20-year-old has previously been linked with the likes of Arsenal and Chelsea.
El Haddadi has previously rejected a move away from Barcelona, but could be interested in a move away from the club this time around.
El Haddadi’s current contract with Barcelona expires in 2017.