The talented Croatian centre-forward enjoyed a superb season on-loan with NAC last term and the Eredivisie are keen to take him on again.
However, Voetbal International says NAC have found negotiations with Chelsea "laborious" and there's concerns the deal is off.
Perica featured and scored last week in a friendly against Aldershot Town.
A loan switch to Spain or a Championship club is now being mooted for the youngster.
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