Millington busy negotiating new contracts with Town’s players
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Both are players that The Shaymen want to keep, but they appear to be attracting interest from elsewhere and it remains to be seen where they will end up.
"Both are exploring their options at the moment," Millington said.
"Harvey's been very clear with us about what he's looking for and who he's talking to.
"His situation will come to a head sooner because he's very clear on what he's looking for if he does choose to move.
"Jack's is a little bit more unclear. I think we made our first offer to Jack back in March and we made our final offer a couple of weeks ago, which does represent a hugely significant increase in pay.”
He added: "It's a very strong offer so we'd like that one to come to a head sooner rather than later but at the moment, we can't seem to find out what is driving the decision and when the decision's going to be made, so we're a bit in limbo on that.
"But we've got plenty of other people we're speaking to at the moment who would come in as replacements, so we're out there actively talking to people who, if decisions aren't made soon, could come in."
On goalkeepers Sam Johnson and Tom Scott, who are also out-of-contract, Millington said: "One much more further advanced than the other, the other one we've just got a couple of things to confirm that would be of benefit to the player going forward.
"But with Sam, very well advanced."
Millington says an offer has been agreed to keep defender Festus Arthur at the club.
"He's clearly got a longterm injury but he's a fantastic young man and the injury sustained was in service of the club so we wanted to make sure he was looked after to some degree from that point of view," said the Town boss.
"But also going forward, we believe he can contribute to trying to help us get promoted. "So there's an agreement in place and paperwork being drawn up."
Arthur missed the FA Trophy final at Wembley with an Achilles injury.
"The medics say it'll be the turn of the year," said Millington on a possible return date.
"If you ask Festus, he thinks he'll be back in November so let's hope he's right!"
Jesse Debrah and Kian Spence still appear likely to leave the club this summer.
"We've no hard and fast information on where they'll be going, certainly not accepted the offers that have gone out to them from us," Millington said.
"If I had to put money on it, I'd expect them to be elsewhere come next season but we don't know that for sure yet."
The Town boss was was due to speak to striker Mani Dieseruvwe about his future.