Plymouth have launched an investigation into allegations a Southend player was abused during the npower League Two clash between the two sides on Saturday.
The match ended in a 2-2 draw, but Plymouth have revealed that after the game the club were informed of allegedly racist remarks coming from a member of the crowd.
A Pilgrims statement read: "We have received a number of complaints relating to crowd behaviour during Saturday's game.
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We are currently conducting a thorough investigation into these complaints."
A statement from supporters group Plymouth Argyle Fans' Trust read: "On Saturday an incident involving abuse coming from a supporter towards the Barn Park end of the Lyndhurst stand was reported to the police by a Trust member.
"Our message to any so-called fans who cannot put aside their own bigotry for 90 minutes is simple: you are not welcome at Home Park."