Everton boss Frank Lampard admits complaints about the officiating for last week's derby defeat at Liverpool have made little progress.
Following the loss, the club wrote to Professional Game Match Officials Limited (PGMOL) to register a complaint about the way a penalty appeal against Anthony Gordon was handled.
It was the second time they had cause to take such action, having received an apology from PGMOL boss Mike Riley last month after the failure to award a potential penalty equaliser against Manchester City for a handball against Rodri.
But there has been no such response this time around.
Lampard said: "I didn't expect there to be another one, to have two apologies in critical games against the two strongest teams in the country. Against Manchester City that cost us a point on the day.
"Against Liverpool who knows what that cost us if we get a penalty and go 1-0 up, that's hard to gauge.
"But they are things which can clearly affect you in a relegation battle."
The FA also wrote to Lampard this week asking him to explain his comments about the officiating in the derby.
"They wrote to me, I wrote back to them. At that point, I haven't heard anything further," he said.
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