Glasgow kicked off their European Rugby Champions Cup campaign with a 24-15 defeat against Exeter on Saturday but were again without Hogg, who has been out with a shoulder injury.
The Scotland international has been working hard on his fitness behind the scenes and O'Halloran has now said he should be back against Leinster.
He told BBC Sport: "He was close to being selected against Exeter so I'm sure he'll be part of the 23 although whether he's starting or off the bench is yet to be determined."
O'Halloran admits his side needs a victory over Leinster following the defeat against the Chiefs.
He added: "We're in a position where we desperately need to win now after getting no points from our first away game but we're pleased with the depth we now have in the squad."