Rook, 29, enjoyed one of the best spells of his career under Tommy Warrilow at Tonbridge Angels after a move from Warrilow’s former club Horsham, reportedly for a significant fee.
He scored 65 goals during his three-year stint at the Longmead Stadium, he scored 65 goals before going on to play for Dartford, Tonbridge again (on loan) and Eastbourne Borough.
He had a brief spell with AFC Hornchurch at the end of last season, scoring in the 2-1 win over Leatherhead which clinched the Ryman Premier runners-up spot and finding the net again in a 3-1 victory over Bury Town in the play-off semi-final.
Earlier in his career, Rook also played for Dover Athletic, Hastings United, Whitstable Town, Folkestone Invicta, Sittingbourne and Deal Town.
He explained his reasons for signing for the Blues: “Even before I spoke to the gaffer, (I knew) that Margate’s always been one of the bigger clubs in non-league. It seems to be heading in the right direction.”