Former Chelsea assistant coach Steve Holland admits the senior players drove the culture during his time at the club.
Holland is now part of England's coaching staff.
He recalled to the Daily Mail: "The top players Didier Drogba, John Terry, Ashley Cole, Frank Lampard, Petr Cech, were completely driven every day,' he says 'They had talent but also made the maximum out of it. As they became experienced, they'd push the rest of the group.
"If we only drew away to Manchester United, the bus was like a morgue on the way back. The next day, nobody is speaking in the corridor. The first half an hour of training, players are kicking lumps out of each other. Everybody is snarling, nobody is smiling.
"It is a strange culture and environment to explain, you just couldn't accept not winning. If losses came, you could hear the helicopter landing in the training ground with the boss [Roman Abramovich].
"It was relentless and stressful but it did create success."
