The Foxes boss was involved in a heated exchange with a supporter during Leicester's 3-1 defeat to Liverpool last week.
It is a routine move from the FA and Pearson has until 6pm on Wednesday to come back with his observations for the governing body to look at.
He refused to apologise to the fan despite calls from the Leicester City Supporters Club to say sorry after a video emerged of the argument.
Pearson said on Friday: "I have had run-ins with fans in the past and in the heat of the moment these things happen and there won't be any apology
Let's put it like this, it's best if we don't speak about what happened on either side, I'm not going to repeat what happened here.
"I am very keen to protect my players and myself and I'm more than happy to stick up for myself in that situation and, more importantly protect my players, that's the root cause of the problem.
"If people were offended by what happened in some ways that is regrettable but there's no need for me to apologise to someone of that ilk."
The Foxes are on a 10-game winless streak and lost 2-1 at Aston Villa on Sunday to sit bottom of the Barclays Premier League.
Source : PA
Source: PA