They labelled Mustafi uncoachable for conceding 51 goals with Arsenal in a season but are suddenly silent about Virgil van Dijk who has conceded 52 so far with a game still to play.
West Ham are set to contact referees’ body PGMOL after their late equaliser against Arsenal was disallowed.
The club will raise concerns and request further explanation over the controversial decision.
BBC Sport understands West Ham will also ask for the audio between referee Chris Kavanagh and VAR Darren England.