Jony, who plays for Spanish third division outfit CD Alcoyano, has suggested that Saul was indecisive about leaving Atletico.
He told Marca, "There were moments in which he was considering staying and others in which it seemed that he was going to leave, but in the end, it was done.
'The last hours of the market we live with nerves and also wanting to solve it."
Jony claims the Spain international felt he 'had to take this step' and his decision to join Chelsea was a 'thoughtful' one.
"It has been a very complicated and very thoughtful decision, and we support him in everything," Jony explained.
"My brother has lived Atleti from a very young age, and he considered that he had to take this step."
Saul's arrival means there will now be four top-class midfielders battling for two spots, which Jony believes will be a 'good challenge' for his brother.
He said: "The issue of competition is good too.
"In the world of football, nobody assures you of anything and that you are going to play as a starter. It is a great challenge for him."
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