Ledley links up with former Wales international colleague Carl Robinson, who was appointed Jets head coach earlier this month, until the end of the season.
"I've come here to play, and I know I'll have to be at my best to earn a spot in the starting XI here in Newcastle," Ledley told the official Jets website.
"The opportunity to work under Carl is one that I'm also looking forward to, we crossed paths in a few Wales camps when I was a youngster and to have the chance to link up with him again is exciting."
— NEWCASTLE JETS FC (@NewcastleJetsFC) February 25, 2020
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