Athletic Bilbao has appointed Óscar de Marcos as Edin Terzic's assistant, the new coach of the team. De Marcos, who retired just a year ago, returns to the club after a successful career as a player. The former footballer will be responsible for developing the players individually and collectively and for connecting with the dressing room. Edin Terzic considers De Marcos a key piece in his new staff. The German coach aims to build a hybrid technical staff between international knowledge and rojiblanca essence. The new staff is already working in Lezama preparing for the preseason, which will start on July 6. De Marcos joins Sebastian Geppert and Peter Gaydarov, Terzic's two most trusted men. Geppert will be Terzic's right-hand man and will assume the role of analysis manager, while Gaydarov will be responsible for training and player transition in Lezama. Óscar de Marcos needs no introduction in Bilbao, where he is considered one of the great modern legends of the club. His career at Athletic has made him the second player with the most games in the club's history, with 573 games played. Now, his role changes completely, but the club understands that his impact can be even greater from within the bench. De Marcos' return responds to the need to strengthen the connection with the dressing room and to develop the talent of the players. The club seeks to take advantage of his experience and natural leadership to improve the team's performance. The preseason will be crucial for the team to prepare for the upcoming season. Edin Terzic will have the support of his new staff to make the necessary adjustments and improvements. Athletic Bilbao is ready to face the new season with renewed energy and a strong technical staff.