The 25-year-old has put pen to paper on a two-year deal, with the Blues also holding an option on the former Spurs apprentice.
As reported by The News earlier today, Danny Cowley had identified Ogilvie to provide left-back competition for Lee Brown.
He had turned down a new deal at Gillingham to become a free transfer this summer, yet continued to train with Steve Evans’ side during pre-season.
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The defender is Cowley’s ninth signing of the transfer window, with the League One season kicking off on Saturday at Fleetwood.
MORE: ‘Connor Ogilvie is potentially a Championship player’ – The inside track on new Pompey defender
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