The 25 year old was released by the Black Cats this summer after a seven year spell at the Stadium of Light.
Paul Thirlwell
He is expected to be given runs out against friendly opposition, starting with Weymouth tonight along with other trialists Micah Hyde, Noel Whelan and Michael Gordon.
Manager Neil Warnock told sufc.co.uk: "Paul is joining us down here for a week and we will have a look at him."