A report by Gazzetta dello Sport has suggested that the 34-year-old is unlikely to remain at the San Siro beyond the end of the season.
Walker had been expected to stay at AC Milan, who have the option to buy the full-back for €5m in the summer, after his six-month loan spell.
The Man City loanee has struggled for fitness and form after initially impressing, suffering a fractured elbow during a recent training session.
Regardless of what happens with AC Milan, Walker will leave Man City in the summer transfer window.
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Lunbkpsyz
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Ac Milan =2gool
pacacdknrz
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AC MILAN AS NEVER BEEN SERIOUS WITH TRANSFERS