After starting all three of Wales' summer Tests against South Africa and Argentina, the full back/wing missed out on selection for the Under Armour Series after suffering a dislocated right elbow in the defeat to Leinster in September.
The 24-year-old from Monmouthshire is targeting the trip to Galway to provide the Dragons with extra firepower.
"Hallam is going to train with the Wales squad and get his treatment there," said Dragons head coach Bernard Jackman. "The plan is that he will be back for Connacht."
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