Rubuta ci gaba don wannan sakin layi - Albarka da girma da matsakaici don tafiya tare da taɓawa mai taushi a kusa da raga, Momesso ya buga wasan hockey na matasa don Shawinigan Cataractes na QMJHL, kuma an tsara shi na 27 a cikin 1983 NHL Entry Draft
da garinsu Montreal Canadiens. Ya fara buga NHL a kakar wasa ta gaba yana da shekaru 18 kawai, yana wasa wasa guda ɗaya don Canadiens, amma ya kasance a cikin ƙarami don mafi yawan lokutan biyu masu zuwa, a lokacin da ya fara mamaye QMJHL kuma ya kafa kansa a matsayin blue-chip NHL mai yiwuwa. A cikin 1984/85, ya zira kwallaye 56 da maki 146 a cikin wasanni 64 kawai, tare da mintuna 216 na horo, kuma an kira shi dan wasan QMJHL na Shekara.