A cage assembly is provided for receiving a pluggable module. The cage assembly includes a cage having a front end, a mounting side, and an internal compartment. The front end is open to the internal compartment of the cage. The internal compartment is configured to receive the pluggable module therein through the front end. A heat sink is mounted to the mounting side of the cage. The heat sink has a module side that is configured to thermally communicate with the pluggable module. An electromagnetic interference (EMI) gasket extends along at least a portion of an interface between the mounting side of the cage and the module side of the heat sink.