Jose Mourinho says "nice guy" football managers can end up becoming a "puppet" at their club, BBC reported.
The former Manchester United manager was sacked in December and replaced by interim boss Ole Gunnar Solskjaer before the Norwegian's appointment was made permanent three months later.
"I don't want to be the nice guy," Mourinho told L'Equipe.
"Because the nice guy, after three months, is a puppet and that doesn't end well."