The Netherlands international has endured a frustrating debut campaign at St James' Park and has not played for the club since August after initially struggling with a recurring thigh injury.
De Jong was nearing a comeback in February before suffering a collapsed lung that saw him endure more time on the sidelines.
The former Ajax man will now make a fresh attempt to return to action before the end of the campaign.
Writing on Twitter, De Jong said: "The last X-ray was all good. So I will start training for myself again."
De Jong has been restricted to just three appearances since moving to Newcastle in July.
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