The 20-year-old has agreed a deal at stadium:mk until January 5 and could face his former loan club Plymouth in a friendly this weekend.
Dons boss Karl Robinson told the club's website: "Jason is someone I have known for a while from my time at Liverpool and Blackburn.
"He is a very gifted footballer who is yet to reach his full potential but showed glimpses of what he can do while he was on loan with Plymouth last season.
"I would like to thank (Palace boss) Ian Holloway for helping this deal happen, and I believe with someone like Ian watching over Jason he could be a great success in the game."
- Sports & Recreation
- Karl Robinson
- Ian Holloway