The 23-year-old Jamaica international grabbed 11 goals in just 20 games for Craig Brown's side last season before a knee ligament injury ended his campaign prematurely.
Leeds boss Peter Reid has monitored his progress since corrective surgery with the player being watched by club scout Adrian Heath in the friendly against Hibernian.
But Preston chairman Derek Shaw told the official club website: "We haven't had any enquiries about Ricardo at all and nor would we want any. He is an important part of Craig's plans.
"He is only just coming back from a serious knee injury and still has a lot of work to do before he is even match fit, but we hope he should be close to full fitness by the West Ham game.
"We have got ambitions for Premier League football ourselves so the idea we would want to sell Ricardo is ridiculous.
"We may not have the money of some other clubs but we have quality in our squad and players like Ricardo are very, very important to our plans and it would take a very large sum to tempt him away from us."