Blades manager Neil Warnock has been chasing the former Manchester United trainee for some time now and for last two seasons came close to signing Macken on loan.
Jonathan Macken: Would be welcome edition at the lane.
Meanwhile Barry Hayles looks to turndown a offer from Leeds United to come to Bramall Lane, the Whites have apparently offered more money but the longer contract and better chances of first team action looks to have persuaded the former Bristol Rovers man.
Both incidentally are on a free transfer.