Guus Hiddink has admitted that keeping a formal relationship with his players is a key factor behind his success.
The Dutchman has enjoyed a sparkling managerial career, both on the domestic stage and at international level.
He is currently trying to work his magic at Chelsea, with the Premier League title and UEFA Champions League crown still within his reach.
The veteran coach will step down from that role at the end of the current campaign as he refuses to juggle the demands of his commitments with the Russian national team with those at Stamford Bridge on a long-term basis.
He is, however, hoping to leave a lasting legacy with the Blues and believes his disciplined approach to management has helped to bring about a reversal in fortune at the London giants.
"We're not close," said Hiddink on his relationship with his playing staff.
"I have to take decisions against some players because they're not playing.
"They might be out of shape, or for tactical reasons. I like to have a very direct, open relationship with my players. I don't want to have a relationship where I might play games with them.
"I don't like that. I have an open relationship. Then I can challenge them with an open mind and an open face. But, on the other hand, a manager should not be having bonds and friendships.
"That's maybe after we have done our job in this club. I like a very straightforward, direct approach because then you can challenge them in a way to be professional."
Hiddink added: "We, and I emphasise this, challenge each other in this group in a very open and direct relationship.
"There's one aim. The aim is to get to the next round. If players are under-performing just knowing that the manager is leaving at the end of the season, it's not the right professional attitude.
"We're very sharp on that attitude. Even though I'm not here next year, they have to respond. If they don't, they're not equipped to be at a big club."