Gallen, 31, tore ligaments in his foot during the Blues 26-6 defeat to Queensland last week, and although he is off crutches he still requires a supportive boot for the injury.
He will be named in the squad by coach Laurie Daley on Sunday night and plans to take part in training before the July 17 showdown at ANZ Stadium.
Gallen said, “I’d like to have a run before the game to make sure I’m right.
“I’m sure Laurie (Daley) will give me as much time as I need.”
Meanwhile, Jarryd Hayne will return to the NSW side after recovering from the hamstring tear that kept him out of Origin II. QLD are currently favorites at $1.75 odds (courtesy luxbet).