from bbc Wigan page
“......In the meantime, with no fans at games, selling players remains the only way of raising money.
Although the transfer window is not open, Wigan are allowed to sell one of their younger players, Jensen Weir, with a deal for the midfielder to join Brighton said to be close.
The administrators have publicly said there will be no fire sale but departures are expected once the transfer window opens on 27 July.”
so it looks like we can’t sign him until 27th if the administrators / new owners are still willing to sell him.
alternatively I think we will still get him on a year long loan