It was in a Champions League match that a team trained by Valverde faced Lopetegui's one
On this Sunday 28, Barça is receiving Real Madrid at the Camp Nou in another Clasico. While it is Valverde's third one, it would be the first as Julen Lopetegui in front of Real Madrid. However, they had faced each others before as Athletic Club Bilbao and FC Oporto trainers.
It was in 2014/15 season in a Champions League match. In Porto, Lopetegui's team won 2-1 and in the match in Bilbao, they won again 0-2. It was in the group H and Athletic Club was relegated to Europa League.
Both coaches played in Barcelona. However they did not coincide. Ernesto Valverde played between 1988 and 1990 and Julen Lopetegui did from 1994 until 1997. After their career as a player, Valverde made his debut as a coach in the Athletic Club B, playing in Second Division B, in 2002/03 season, while Lopetegui did it in the season 2003/03 in Rayo Vallecano in the Second Division.