Pellegrini coached Coudet when they were together at River Plate.
Ahead of tonight's clash, he recalled: "I had the fortune of directing Eduardo as River coach in Argentina, a player who later came to Europe , with great dedication, leadership over the group and from that moment it seemed to me that he was going to be a coach.
"He decided and has shown in South America his ability and coming to Spain are good for his progress and it is good for the Liga to have him.
"He proposes a football that reflects his great team mentality. That has been transmitted to Celta and I'm very happy for him. Surely Spain has a high-quality coach for many years."