Fulham have targeted a move for Whittingham as they seek a replacement for Danny Murphy.
Martin Jol's side are thought to have tabled a £2million offer for the former England Under-21 international, but Cardiff have snubbed the offer.
Whittingham has been a target for a number of Premier League clubs after impressing for Cardiff over the last few seasons.
The 27-year-old, who joined Cardiff from Aston Villa in January 2007, is under contract at the Cardiff City Stadium until 2014 and the club are keen to keep hold of him.
It remains to be seen if Fulham will come back with a new offer for Whittingham as Jol looks to bolster his squad before the start of the new season next month.
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