The former Hull City chairman will concentrate on other business areas.
“Hull FC needs my complete attention, so that is what it will get, as we look to take care of some areas of the club in relation to supporters and corporate partners,” said Pearson.
“We have to fight for financial support against the City of Culture 2017 sponsor packages which are eating into our traditional sponsor database.
“We have a very good management team behind the scenes so I see my role as re-engaging with lapsed and now lost sponsors and our supporters in order to ensure the club is on a sound financial footing for the years to come,” he added.
Pearson’s brief tenure at Elland Road ended suddenly on Tuesday, following the Whites defeat to Ipswich Town, to the surprise of the fans and club staff alike.
The former Hull City and Derby Country chairman had only been at the club for four months and his departure was met with sadness by Leeds boss Uwe Rosler, who was said to be ‘devastated’ by the developments.
"Nobody saw it coming," said the German, in quotes published by BBC Sport.
"The only thing I can say is that the working relationship between Adam and myself and Adam and Mr Cellino had been very good…You can believe me by that. I hope to see him again some day."
Pearson left Sheffield Wednesday to assist Leeds owner Massimo Cellino in the running of the club in May, but has now returned his focus to Hull FC, a club he purchased in 2011.
His exit comes in the wake of the end of the Whites' unbeaten run - after Ipswich edged a 1-0 victory at Elland Road on Tuesday night - and Rosler will be determined for matters on the pitch to take centre stage once again, with Saturday's clash with MK Dons fast approaching.