The Hammers suffered a 5-0 defeat to Premier League rivals City at home in the third round of the FA Cup.
Former West Ham striker McAvennie was following the match, and he has taken to Twitter to give his reaction to the final result.
Over the course of the 90 minutes at the London Stadium on Friday evening, hosts West Ham had just 33% of the possession, took seven shots of which two were on target, and earned three corners, according to BBC Sport.
Visitors City had 67% of the possession, took 18 shots of which 11 were on target, and earned seven corners, according to BBC Sport.
The performance of West Ham were hugely disappointing and left much to be desired. It was one of the poorest displays from Slaven Bilic’s side all season, and fans will not be happy.
West Ham will return to action on January 14 when they take on London rivals Crystal Palace at the London Stadium in the Premier League.