Chelsea fought back from 3-0 down to draw level with West Brom on Saturday.
But Frank Lampard was frustrated with the way his side performed and believes Marcos Alonso and Thiago Silva were at fault for Chelsea's embarrassing first half woes.
Mason Mount, Callum Hudson-Odoi and Tammy Abraham scored a goal each to secure a point for Chelsea but Lampard admits it feels like two points dropped for the way his side threw the game away.
“I spoke about set pieces before the game. We can't legislate for pure mistakes, which they were today,” he told Sky Sports
“It then gives you a really difficult game to get back into so I can laud character because we did show character and persistence.
“But we didn't need to if we did things properly in the game.
“It was mistakes, clear mistakes, Marcos heads it straight into the middle of the pitch for them for the transition.
“The Thiago [Silva] one is a mistake, he's been around long enough to know that, he certainly give them that one in his first game.
“Marcos then loses his man for the third goal from the corner. They're clear mistakes, I can do as many meetings as you want but if you make mistakes you give yourselves a mountain to climb.”
This article was most recently revised and updated 12 months ago