"I think what they need to do is get back to their identity You ask people what Leicester City are they would say they are a very good team who work hard," Pearson told British media.
Leicester were bottom for most of the 2014-15 campaign but pulled off a stirring turnaround under Pearson to stay up after winning seven of their last nine matches to finish 14th. He was replaced by Claudio Ranieri in the subsequent off-season.
"They out-work people and even that has been questioned of them this season. They have to make sure if there are any question marks internally they find the answers. That is the bottom line," Pearson added.
"You can't spend your time listening to people who have opinions externally. There have been criticisms coming their way and they have to find the answers to that.
"You can spend a lot of time talking but now is probably the time for actions rather than words."
Leicester travel to third-tier Millwall in the fifth round of the FA Cup on Saturday.
(Reporting by Shravanth Vijayakumar in Bengaluru)
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