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Aneke initially joined the League One club on a month's loan in December, but after impressing in his five appearances he will now stay with the club for the rest of the season.
Meanwhile, Guy Madjo has signed for League Two Aldershot for a five-figure undisclosed fee.
Madjo, who joined in the summer on a free transfer, has failed to make an impact at Broadhall Way and has spent time on loan at Port Vale.
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