Blades boss Kevin Blackwell will be keen to bolster a slim defensive line up with full back Powell who has 5 England in international caps to his name whilst North Ireland international (14 caps 2 goals) Feeney would add to what is already a considerable strike force.
Sheffield United currently have; James Beattie, Billy Sharp, Rob Hulse, Jonathan Stead, Luton Shelton and Danny Webber in their attack whilst Geoff Horsfield is being released.
Former Leeds United forward Feeney spent time at Swansea City last season; scoring five goals in ten appearances - the Swans may also show an interest.