Valdes, Puyol's former teammate, was relieved of his duties as Juvenil A coach following disagreements with the club, yet Puyol did not shed much light on the decision.
"Victor as a coach still does not have much experience," former Barca captain Puyol explained.
"Last season he did very well. In the world of football, he has a lot of knowledge to teach children.
"I don't know the reasons for his departure, and I'm not inside the club, but I'm sure he'll be a great coach [in the future] and will help develop some great footballers.
"Youth football is not easy, you have to focus on the training of the players and not so much on the results."