Aaron Goodwin, agent for Damian Lillard, has called prospective trade partners with a "warning against trading for his client," sources tell ESPN's Adrian Wojnarowski.

Lillard strongly prefers a trade to the Miami Heat.

"Goodwin is telling organizations outside of Miami that trading for Lillard is trading for an unhappy player," writes Wojnarowski.

The Portland Trail Blazers are attempting to broaden the trade market for Lillard beyond the Heat. Other teams interested in trading for Lillard include the Philadelphia 76ers and Los Angeles Clippers.

Lillard is owed $216 million over the next four seasons on his contract.