The former Holland international – still just 26 years old – has managed only one hour of top-flight football in the past 12 months.
First he was sidelined for four months following thigh surgery before returning and being hospitalised with a collapsed lung for the second time in his career.
De Jong has started just one Premier League game since signing for Newcastle last summer
Newcastle United's Dutchman Siem de Jong already has his sights set on finishing his career in MLS
The former Ajax captain came to Newcastle with a reputation as one of Europe's most intelligent playmakers
De Jong - a £6million signing from Ajax – had arrived at St James' Park with a reputation as one of Europe's most intelligent playmakers but is yet to make an impact on Tyneside.
He still wants to see out his contract with the Magpies - which runs until 2020 - but admits that a move to MLS does appeal to him.