Encore Boston Harbor, the $2.5 billion casino complex under construction on the Mystic River in Everett, has announced plans for a Asian-fusion restaurant and lounge and a luxury nightclub.

New England-based Big Night Entertainment Group, which runs nightclubs and restaurants in Greater Boston, has signed a lease to operate a 16,400-square-foot restaurant and lounge, to be called Mystique, and an 8,000-square-foot luxury nightclub, to be called Memoire, the casino said Wednesday.

The restaurant will have a contemporary Asian-fusion menu featuring “sushi, traditional Asian delicacies and innovative new dishes,” Encore Boston Harbor said in a statement. It will seat more than 530, including a 94-seat lounge with wrap-around bar.