The Thunder could soon be in a position where they are unable to retain their entire core due to financial constraints.
James Harden will become eligible for a contract extension this offseason and would become a restricted free agent in 2013 if no deal is reached.
Russell Westbrook signed a five-year extension with Oklahoma City last January.
Harden or Westbrook are more likely to be moved than Kevin Durant.
ESPN's Chris Broussard asked 22 NBA executives which player they would trade if they had to for financial reasons. Fourteen of the executives replied that they would trade Westbrook, while eight said Harden.