The Hammers played out a goalless draw with West Brom away from home at The Hawthorns in the Premier League.
Former West Ham winger Sinclair has taken to Twitter to give his reaction to the the final result.
Over the course of the 90 minutes at The Hawthorns on Saturday afternoon, hosts West Brom had 37% of the possession, took six shots of which one was on target, and earned two corners, according to BBC Sport.
Visitors West Ham had 63% of the possession, took nine shots of which one was on target, and earned three corners, according to BBC Sport.
Slaven Bilic’s side will return to action on Tuesday evening when they take on Bolton Wanderers at the London Stadium in the EFL Cup.
The Hammers will face Tottenham Hotspur at home in the Premier League next weekend.