Lions vice-captain Tom Rockliff revealed Hanley was on track for a surprise early return from his hamstring tear for the AFL's venture to Wellington.
The slick Irishman suffered the injury in the 113-point round four capitulation to Port Adelaide and was expected to be out for four weeks, but will undergo a fitness test before the Lions cross the Tasman.
They are already certain to have Merrett back from suspension, while goalsneak Josh Green is poised for his first start this season after overcoming his own hamstring problem.
It's not quite the cavalry for the winless Lions, who were missing eight of their best 22 against Richmond on Thursday, but a significant boost.
Hanley was the Lions most dangerous midfielder last year when he finished second in the club's best and fairest count, while Green was their third best goalkicker.
"I think we'll have three or four changes this week," Rockliff told AAP.
"Early signs suggest (Hanley) can get up.
"Fingers are crossed he can get through his fitness test."
The only team without a win this season, there's extra pressure on the Lions to succeed in Wellington with games against the Sydney Swans, Essendon and North Melbourne to follow.
Justin Leppitsch's men could easily be 0-9 going into their round 10 bye.
Rockliff has been bullish throughout the year about the direction of the club under new coach Leppitsch, however rebuilding is now the focus..@rockwiz38 holding the fort for the 7th Brigade @brisbanelions pic.twitter.com/OCZIHjDwvd
— Clare Pettyfor (@clarepettyfor) April 21, 2014
"We're definitely in that rebuild phase but one thing you can't compromise on ever is your effort," he said. "At times during the year we have dropped off, in games, on that.
"A nice four-quarter effort against St Kilda would be fantastic."
Rockliff said he believed St Kilda spearhead Nick Riewoldt was in career-best form and said Merrett's return would be timely.