The Bay are also boosted by the return of James Ellison, Chris Noone and Wes Baynes after illness, suspension and injury.
Holsgrove, whose previous clubs include, Halifax Town, Guiseley and Altrincham, has joined from fellow strugglers Stalybridge Celtic and will be in his third spell with the Seagulls.
He has previously played as a striker, but these days says he prefers to play in central midfielder.
Seagulls boss Gus Williams, who will miss the Tamworth game as he is away with the Wales Under 16s side in Poland as part of their preparations for the Victory Shield tournament, commented: “Kevin is a big, strong boy and his strength and experience is something we have needed in the middle of the park.”
Holsgrove’s arrival comes after plans to bring in a midfielder on loan from League Two club Accrington Stanley were dashed this week when the player decided he didn’t want to come.
Gus has asked former Burnley winger and reserve team coach Ashley Hoskins to come in to help run the team in his absense, alongside fitness coach Dan Nolan, and they face a tough task against a Tamworth side who have been transformed since former Wrexham boss Morrell took over.
They were in the bottom three with just one win in ten games when Colwyn Bay drew 1-1 at The Lamb in September, but they are now in the top three and under Morrell have lost only once in their last 16 games (12 wins and two draws), to become strong contenders for a swift return to the Conference Premier via the play-offs.
Up front man Rob Hopley will be playing his 250th game for the Seagulls.
Colwyn Bay (from): Sanna, Rees, Taylor, Moss, Wilson, Lea, Royle, Noone, Buckley, Anoruo, Hopley, Williams, Baynes, Ellison, Holsgrove, Haywood, Saiel.