The relationship between Chelsea manager Jose Mourinho and David Luiz reportedly reached an irreparable state, which led to his big-money move to Paris Saint-Germain.
Before the World Cup, the defender sealed a reported £50m switch to the Ligue 1 champions after spending three years at Stamford Bridge.
According to Spanish newspaper El Confidencial, the transfer was sanctioned by Mourinho after his relationship with the Brazilian 'deteriorated' throughout the course of last season.
The publication claims that the 27-year-old, who is thought to have been a popular figure in the dressing room, needed to be in a 'happy environment', but that was not possible under Mourinho's leadership.
Luiz received widespread criticism for his performance in Brazil's shocking 7-1 defeat to Germany in the World Cup semi-final on Tuesday in Belo Horizonte.