Newcastle United goalkeeper Tim Krul will visit an ankle specialist on Monday to discover the extent of the injury he picked up in the Europa League victory over Metalist Kharkiv.
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Krul, 24, put in a Man of the Match display in Ukraine as the Magpies won 1-0 to progress to the last-16, though he suffered a painful knock in a challenge by Jonathan Cristaldo and left the stadium on crutches.
The Netherlands international saw club doctors on Friday but has been referred for further assessment and it is as yet unclear how long he will be sidelined for.
A short statement on the Newcastle's official website read: "Newcastle United can confirm that Tim Krul was assessed by club medical staff on Friday and sent for a scan on Friday afternoon after sustaining an ankle injury in Thursday night's Europa League match against Metalist Kharkiv in the Ukraine.
"Krul is now scheduled to see an ankle specialist on Monday for a further assessment, after which time the club should be able to provide another update.''
The announcement means Krul is unlikely to feature in Sunday's Premier League clash at home to Southampton, with Robert Elliot likely to deputise for him.
Information from the Press Association was used in this report