The West Ham forward, who can play down the middle or on either flank, arrived on loan at The Hawthorns on Monday but cannot formally complete his switch until the emergency window reopens on Tuesday.
His arrival is designed to combat the loss of Ishmael Miller (ankle) for at least two weeks, while winger Jerome Thomas also starts a four-match ban following his late dismissal in Saturday's 1-0 win at Plymouth.
However, deadline-day signing Andy Slory is also competing for his first start on the wing having already made two substitute appearances since his arrival from Feyenoord.
Marek Cech (hamstring) missed Saturday's trip to Home Park and he is ruled out once again but, having been rested for the clash, first-team trio Jonas Olsson, Gonzalo Jara and Robert Koren will all be pressing for a recall.
Giles Barnes (Achilles) and James Morrison (heel) hope to return by the start of March.