Hatters in discussing with QPR for Michael HarrimanTown boss John Still has held discussions on Thursday on the availability of signing Michael Harriman.
The 22-year-old defender returned to parent club Queens Park Rangers last week but has continued to train with the Hatters following the expiry of his loan .
And the Town manager is hopeful that a deal could be struck before Saturday's League 2 game away to Plymouth Argyle.
"We've been on the phone this morning to QPR," explained Still at his Thursday press call. "It's still ongoing, it has been on a daily basis.
"There have been a few changes behind the scenes at QPR at that level and I think it's almost a case of getting somebody to make a decision on how they see Michael's future.
"We've talked this morning and we'll talk again this afternoon [Thursday]. Whether or not that's a permanent or a loan for the rest of the season, I don't know - but we're hoping it can be done.
"It would be a low to lose him as Michael's done very well."
If Harriman does miss out, Paul Connolly is likely to start at right-back against one of his former clubs, but the Town could be without midfielder Luke Rooney with a slight groin problem.
Still also revealed that midfielders Alex Lawless, Pelly Ruddock Mpanzu and Luke Guttridge will also miss out, despite the former playing 45 minutes for the development squad on Monday.
The Town are keen not to rush the trio back to soon, but Guttridge has started light training this week.
Paul Benson and Curtley Williams are the other two players unavailable.