This follows the news current Forest number 1 Lee Camp is set to leave the City Ground on a free transfer before the close of the January Transfer Window as the 28-year-old Northern Ireland international's contract, that's due to expire at the end of the season, will not be renewed.
This will leave Forest short on stoppers with Walsall likely to pay the price.
22-year-old Darlow originally joined The Saddlers in September 2012 and made around seven first team appearances but was recalled just over a month later due to 'keeper shortages.
It is understood his current loan deal has a 24-hour recall clause that seems likely to be activated soon, leaving The Saddlers short on cover.