New Zealand-born Dibley-Dias, 21, spent the first-half of last season on-loan with Northampton.
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He has now joined League Two Chesterfield on a season-long deal.
Dibley-Dias said: “It feels good. I’m happy we got it done quite early and I can get used to the team and crack on and have a good pre-season. I’m excited.
“I know quite a few of the boys that were here last season like Michael (Olakigbe), Devan (Tanton) and Harvey (Araujo). They’ve all had good things to say and just rave about the place.”