In the season 2002 - 2003, he was part of the Management Team at Atlético de Madrid, in the team work of Paolo Futre, Abel Resino, Manolo
Sánchez and Vicente Montes.
He serves too as the Assistant Coach of Luis Aragonés, alternating with Scouting and Player Tracking. He was also an Assistant Coach
to: César Ferrando (2003 - 2004), Carlos Bianchi (2004 - 2005)
and Javier Aguirre ( 2005 - 2006).
In the season 2006, César Mendiondo left the Atlético de Madrid to work at the
Spanish National Football Team, as Assistant to Luís Aragonés during all the classification for Eurocopa 2008.
In 2008, they won the title as European Championship.
After retiring as a football player, the CP. Mérida offered him the job of Technical Secretary.
He work as Second Coach for Jorge D´Alessandro and PacoHerrera. He alternated the roles for three seasons, since 2001.