Mic channel as an external input in ableton?

Im using djm 900 nexus as a soundcard and was wondering if i can use the mic input from the 900nxs as a seperate channel in ableton live 9. All 4 channels on the mixer is currently being used in my set up already with drum, bass, samples, and a channel for my maschine mk2. I wanted to do something with recording vocals and i was hoping i could use the mic input as an extra channel