The £5.8million summer signing is expected to be sidelined for six weeks after suffering a partial break during Saturday´s 1-1 friendly draw at Carlisle.
The injury was confirmed in a statement released on the club´s official website, www.nufc.co.uk, which said: "Newcastle United midfielder Joey Barton will have an operation on Monday after suffering a foot injury during Saturday´s pre-season friendly at Carlisle United."
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