Robert Beasley's upcoming book Jose Mourinho: Up Close and Personal says the Ghana international was holding a party to celebrate his 30th birthday in December 2012.
However, splits in the dressing room which were a constant during Mourinho's time at Madrid resulted in only Luka Modric and Ricardo Carvalho attended.
The mass snub left the former Chelsea man devastated and the Portuguese coach had to offer him support.
The book claims: "Mourinho said that Madrid was a political club with warring factions and told me a story about Essien inviting teammates to his 30th birthday but only a few turned up.
"He had to console Essien, saying it was nothing personal and that it didn't mean the players didn't like him but they simply were only concerned with themselves and had better things to do."