restrictions apply if based on a foreign license.you need a VALID foreign license and a VALID FAA third class medical check.
You need to file a XXX form by the CAA.This form will be send to the FAA.
Apply at any FSDO in the USA with your VALID foreign license and your VALID medical check.2-3 months later, you will receive by mail by the FAA your US Privat Validation.
This FAA validation is void if your foreign license (JAA ) is expired.