Answer
Béla Guttmann, the manager of Real Madrid at the time, was the individual who had disagreements with Puskás Jr. These disagreements prompted Puskás Sr. to make a comeback to the club as the new manager, replacing Guttmann. The reasons behind the conflict between Guttmann and Puskás Jr. remain unclear, but it ultimately resulted in a managerial change that brought Puskás Sr. back to the helm of Real Madrid.