West Ham manager Sam Allardyce bemoaned referee Kevin Friend's performance in his side's 1-0 loss to Hull City on Saturday.
Robbie Brady's controversial 12th-minute penalty was enough to settle an entertaining affair at The KC Stadium.
But the decision was a controversial one as the winger went down when challenging Joey O'Brien in the penalty area, and there appeared to be little contact from the West Ham defender.
Allardyce's side were then twice denied penalties of their own in the second half, with handballs from Curtis Davies and Jake Livermore going unpunished by Friend.
And the 58-year-old intends to speak to the official to let him know of his displeasure.
"It wasn't a penalty," Allardyce said.
"Robbie Brady profited by simulation - by diving. Referees are supposed to be good at spotting these things, but he wasn't.
"The Jake Livermore handball wasn't given, so that's two big decisions that have gone against us.
"The referee has given a very poor performance today. I will go and mention to him now that I am disappointed."
West Ham have now gone five games without a victory in the Premier League, with their only success coming on the opening day of the season in a 2-0 win over Cardiff City.