While the event has not been officially announced, it is expected for UFC heavyweight champion Cain Velasquez to headline the card in a heavyweight title bout against Junior dos Santos.
The Web site also reports that Fitch was cleared by his doctors to begin his training camp by September after he underwent shoulder surgery earlier this year that forced him out of action for six months.
This will be the second encounter between the two competitors, as their first bout was ruled a draw at UFC 127. The decision was met with controversy, and Fitch has demanded a rematch with the Hawaiian ever since.
UFC 138 is tentatively scheduled for Nov. 19, live from the HP Pavilion in San Jose, Calif.