Former Chelsea defender Ashley Cole has blasted Andreas Christensen's defending in Chelsea's 3-2 defeat away to West Ham on Wednesday night.
The Blues' five-match winning run came at an end as the Hammers snatched a late winner to boost their survival hopes.
The mistakes leading to the three goals were caused by individual errors, and even though Frank Lampard defended his defensive unit, Cole, currently part of the coaching staff at the club's youth teams pointed out where they failed at the London stadium.
Willian opened the scoring for the Blues from the spot on the 42nd minute, but the hosts pulled level a few minutes later to go into the break tied at 1-1.
The Hammers took the lead immediately after the restart, but the Brazilian struck a perfect free-kick to draw level once again.
But they were punished yet again as David Moyes' side grabbed the winner on the 89th minute to bag maximum points and breath some life into their survival hopes.
Meanwhile, the damaging loss to Chelsea meant they missed the chance to move above Leicester in the table, and are now two points off Wolves and Manchester United in fifth and sixth.