The Spain international was a regular feature for Barca's first-team at the beginning of the season with Luis Suarez unavailable due to suspension.
The 19-year-old has not featured under Luis Enrique since January, but his magnificent lob for Barcelona B may have caught the boss' attention.
The 85th minute effort secured a vital 2-1 win against Ponferradina with the side fighting for survival in Spain's second tier.
Arsenal and Chelsea were both linked with loan moves for the youngster and are expected to renew their interest in the summer window.
El Haddadi can only hope there were scouts at the game…