Pearson says Mariappa "looks exceptionally well and feels very well himself" following his positive test for Covid-19.
He told Sky Sports News: "When I saw him for the test last week, I was sitting in the car park chatting to players as he came past so I had a chance to touch base with most of them.
"He looks exceptionally well and feels very well himself so I think it's an example of how this virus can affect people in different ways.
"He's following the advice and recommendations and isolating for a week. His family are all okay as well. I have no doubts in his case he'll be fine when he comes back in."