Williamson has been out of management since being axed by Plymouth Argyle in September 2005.
Meanwhile, Aberdeen have compensated for the loss of Miller by signing Steven MacLean on loan from Plymouth Argyle.
The 26-year-old has been training with United while attracting interest from the likes of Plymouth Argyle and Raith Rovers.
BBC: SPORT | Football | My Club | Dundee Utd | Wilkie signs Dundee United deal
Former Plymouth Argyle chairman Dan McCauley who owns Drake's Island, announced plans to create a hotel in December 2011.
BBC: Drake's Island plans turned down by Plymouth City Council
Ownership of the entertainment venue, the Plymouth Pavilions, has been transferred from the city council to the owner of Plymouth Argyle.
Plymouth Argyle heads a consortium of regional supporters, including Plymouth City Council, Devon County Council, Cornwall Council and the University of Plymouth.
Plymouth Argyle finished fourth from bottom in the Championship last season with 51 points, while third-from-bottom Norwich were relegated with 46 points.
Earlier on Saturday, Torquay United and Plymouth Argyle football players wore the iLIVEiGIVE T-shirts during their warm-up at Plainmoor before the derby.
"Plymouth Argyle confirm that Ian Holloway has tendered his resignation as manager of the club, " said a statement from the Championship side.
The 20-year-old Manchester United player, currently on loan at Plymouth Argyle, came in following the withdrawal of injured pair Jonny Evans and Chris Baird.
And, in his only league appearance for Stoke, at Home Park in a 2-2 draw against Plymouth Argyle over Christmas, he was sent off.
BBC: SPORT | Football | My Club | Notts County | Notts keeper out for two months
Exeter City is due to play Plymouth Argyle at home later.
BBC: Banning orders warning ahead of Exeter and Plymouth match
The Plymouth Argyle player was capped 56 times for his country.
Mr Brent's plans include a residential and retail development, sport and leisure facilities to complement the Plymouth Life Centre and a proposed new grandstand at Plymouth Argyle's Home Park.
He was loaned out to Sheffield United and Plymouth Argyle before Portsmouth released him in 2006 and Stoke boss Tony Pulis made Pericard his first signing on a three-year deal.
The Georgia international, who has 55 caps, is comfortable at full-back or centre-half and goes straight into the Magpies squad for the visit of Plymouth Argyle to the North East on Saturday.
If Plymouth is chosen for 2018, it will be a major money-spinner for the local hospitality industry, with thousands of fans flocking to a new 43, 000-seat stadium at Plymouth Argyle's Home Park ground.
With another season in the third tier of English football now confirmed, many of the Grecians supporters will be eagerly anticipating renewing the local derby with neighbours Plymouth Argyle, who were relegated from the Championship last month.
Injuries took their toll at Fratton Park, and in a bid to reclaim his place in the side he was sent out on loan to Plymouth Argyle and Sheffield United before joining former Argyle boss Tony Pulis at Stoke in 2006.
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