O'Halloran set to sign on loan for the Spireites.
Bolton Striker O'Halloran hoping to come to the Spireites for 3 months, Cook watched him when he was boss at Accrington.
He made 7 appearances for Sheffield United last season, making his debut against the Spireites, coming on in the 81st minute in a 4-1 victory for the Blades. His last appearance for the Blades was at Wembley in the Play-off final against Huddersfield, coming on in extra time, he scored a penalty, although the Blades lost in the shoot out. He has also played for Scotland at 21 level earning 2 caps for his Country.
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