Watford are certainly not short in El Hajjam's position.
Watford scouts are said to have watched the 26-year-old regularly and the Hornets are reportedly ready to move for him when the transfer window reopens.
It is claimed that Watford boss Marco Silva wants 'competition in that area of his team' - despite having Kiko Femenia, Daryl Janmaat, Brice Dja Djédjé and Tommie Hoban on his books already - and that El Hajjam 'could increase in value' if he impresses in the Premier League.
This is El Hajjam's first season in France's Ligue 1, having helped Amiens to back-to-back promotions beforehand.
However, the French-born player is apparently being tipped for a place in Morocco's squad for the 2018 World Cup.
El Hajjam would be the second Moroccan at Vicarage Road, after winger Nordin Amrabat, who is currently on loan to Leganés in Spain's La Liga.
Do Watford need another right-back in January? What would El Hajjam's signing mean for Janmaat, Dja Djédjé and Hoban?