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Chesterfield fell to a 3-1 Proact defeat as despite creating the majority of the game's chances a professional Gills performance saw the Kent side win in Derbyshire.
The Spireites have agreed to loan striker Armand Gnanduillet to Stevenage for a month.
Dean Saunders gave an honest assessment of his youthful Spireites side after they lost 2-1 at Rochdale to go out of the Johnstone's Paint Trophy in the second round.
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