His teammate and Nigeria international Awaziem was also in action in the game, forming a four-man defence along with Adil Rami, Yanis Hamache and Reggie Cannon.
Njie hit the ground running, opening the scoring three minutes into the encounter after he was set up by Alberth Elis and in the 10th minute, Gelson levelled proceedings for Rio Ave.
The 27-year-old attacker handed the Chequered ones the lead in the 13th minute with a fine strike to complete his brace after benefitting from another Elis assist.
Boavista suffered a big blow in the 56th minute when they were reduced to 10 men after Hamache received his second yellow card and was subsequently sent off.
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