The former Sunderland midfielder is likely to miss important games against teams in the relegation battle with them, Bournemouth on Nov. 7 and Aston Villa on Dec. 19.
Meanwhile, defender Mike Williamson has joined Championship side Wolverhampton Wanderers on a month's loan.
The 31-year-old, who made 33 appearances for the Magpies last season, has found first-team opportunities hard to come by this campaign, having made two appearances, both in the League Cup.
Newcastle host 14th place Stoke City in the league on Saturday.
(Reporting by Shravanth Vijayakumar in Bengaluru; editing by Amlan Chakraborty)
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