Judging from the video room is Cesar Soto Grado.
This is the sixth El Clasico that Lahouz is managing arbitrator.
During the past 5 matches that Lahouz managed, Real Madrid won 3 times, Barcelona won once, and the two teams drew once.
The last of them was in the second round of La Liga last season, which saw Real Madrid win 2-0 with goals from Vincius Junior and Mariano Diaz.
Lahoues managed one match for Real Madrid this season, in which Karim Benzemas companions beat Atletico Madrid 2-0 in La Liga.
While he has managed 3 matches for Barcelona this season, two in La Liga, he defeated both Osasuna 4-0 and Athletic Bilbao 2-1.
It was the third match in the Copa del Rey semi-final first leg against Seville, which Barcelona lost 2-0.
Lahues was a judge for the summit of Bayern Munich and Paris Saint-Germain on Wednesday in the first leg of the Champions League quarter-finals, which the French guest won 3-2.