Williamson has fallen down the pecking order at St James' Park and Wolves have moved to sign him up on a one-month loan deal.
It is anticipated the deal will be completed today.
If he joins the centre half will help ease a growing injury crisis, with Kortney Hause and Ethan Ebanks-Landell on the sidelines and Dominic Iorfa a doubt for Saturday's crucial West Midlands derby against Birmingham City.
Former Watford defender Williamson has five seasons of Premier League football under his belt at St James' Park where he has been a regular in the team up until this season.