Indeed, initially, Sinclair heaped praise on West Ham boss Slaven Bilic for bringing on Andy Carroll.
Carroll came on and scored the Hammers' second goal at Stamford Bridge - one that had looked like a winner for some time.
In response, Sinclair tweeted the following:
However, the pundit was left frustrated when Chelsea were awarded the penalty they converted to make it 2-2 against West Ham.
The east London side left the Bridge with a point as a result but there will be severe annoyance at Upton Park if those two dropped points end up costing West Ham in their pursuit for a Champions League place.
Clearly any possible contact on LC was outside the box ##CFCvWHUFC surely the ref and linesman can work that out?— Trevor Sinclair (@trevor8sinclair) March 19, 2016
Sinclair wasn't the only one to question Chelsea's penalty and the Hammers faithful have been left outraged on social media in general...