Ashley Cole feels head coach got a key substitution wrong in the 3-1 defeat at on Sunday.
Chelsea youngster Carney Chukwuemeka registered his first senior goal to make it 1-1 in the first half after Nayef Aguerd opened the scoring for the Hammers.
But Chukwuemeka was forced off at half-time and Pochettino replaced him with , a decision that former Blues defender Cole criticised.
The west Londoners saw their level drop in the second half and West Ham ran out as 3-1 winners with goals from Michail Antonio and Lucas Paqueta.
‘Maybe the substitution [Chukwuemeka off, Mudryk on] caused an issue,’ Cole told Sky Sports.
‘They lost a bit of impetus in the game. They’re weren’t getting the runs in behind between right-back and centre-back. It was all then too easy for West Ham.
‘Pochettino will have understood the context behind the change but I felt they lost a bit of ability to drive beyond and cause West Ham a problem. They lost a little bit of power and impetus to sustain attacks.’
Enzo Fernandez could have put Chelsea in front before half-time but his penalty was saved by Alphonse Areola.
‘Chelsea would have been disappointed at half time not to be in front,’ Cole added.
‘You’d have expected them to come out and be aggressive, press in the same way as they did in the first half.’
