The 30-year-old dual-code international, whose signing by the French club caused a furore in the game, has been sidelined since being sacked by Rugby Australia last May after claiming "hell awaits" gay people.
But Folau, who switched codes a decade ago, is in his second week of training with his new team-mates and could make his comeback in the French club's home game against Castleford on Saturday.
"We're not sure," Dragons boss Steve McNamara said.
"We didn't take him to Wakefield, we left him here to do some more training, which he completed.