Reflecting on his tenure, Castro noted the strength of Al-Hilal and compared the situation to the eternal rivalry between Real Madrid and Barcelona.
"It feels like things would have been different without Al-Hilal, but that's life," he told Record. "Real Madrid often don't achieve their goals because Barcelona exist and vice versa. A team doesn't stop being great just because they don't win at a certain point.
"Al-Hilal had Mitrovic, Cancelo, Ruben Neves, Bono, Milinkovic-Savic... They also broke the Guinness record for consecutive wins. But I have a clear conscience: we gave everything we had and managed to improve the team."