The 46-year-old Hoskins comes on board after helping out last weekend in the win over Tamworth, when the manager was away on international duty with the Wales Under-16 squad.
He helped Burnley reach the Football League Trophy final at Wembley in 1988 against Wolverhampton Wanderers, scoring in the Northern area final against Preston North End, and was later reserve team coach at Turf Moor for a while.
Gus Williams commented: “I’ve known Ash for about eight years and know his strengths. He brings a different voice and ideas to the set up and has previous experience of working in the Conference North.
“He really enjoyed it last week and found the club very welcoming and all the players seemed to take to him as well.
“Dan has been been doing a great job for us since I took over and he moves up to joint assistant manager from first team coach.”
The new management trio will be looking for a repeat of last week’s excellent performance when they travel to Harrogate Town on Saturday, knowing another win could lift the Seagulls out of the bottom three should Gloucester or Brackley lose.
“The players set the bar last Saturday and now they have to apply themselves individually and collectively to take that level of performance into every game between now and the end of the season,” said Gus.
Unfortunately Tom Buckley is ruled out of the Harrogate game with a back problem and Louis Moss is away on World Cup duty with Barbados, so Adam Hodgson and Gareth Rees come back into the squad.
Wes Baynes, however, is fit after having to come off in the second half against Tamworth, while Mike Lea makes his 200th appearance for the Seagulls at left back.
Kevin Holsgrove, after his excellent game last weekend, continues in midfield and the manager commented: “Kevin has been outstanding in training this week and he is a clever player who we see as a big acquisition to the club.”
The squad to travel to Harrogate is: Sanna, Rees, Baynes, Wilson, Royle, Lea, Anoruo, Noone, Holsgrove, Ellison, Williams, Hopley, Haywood, Saiel, Taylor, Hodgson.
ROB HOPLEY, who made his 250th appearance for the club last week, will be featured on the Match of the Day spin off programme on the CBBC television channel on Saturday morning (7.40am) focusing the day in the life of a semi-pro footballer.
For those not travelling to Harrogate, the Reserves play a Reserve Cup semi-final against Llandyrnog United at Llandudno’s Maesdu Park on Saturday (2.30pm and would appreciate any support.