The English full-back went down awkwardly following a clumsy challenge from William Saliba and required medical attention before leaving the pitch in the 77th minute.
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"I am concerned because he's such an important player for us. He's been magnificent at the start of this season. He's a big player, so if we are going to lose him it's going to be a huge blow."
The Magpies poor start to the new season worsened with a home defeat to Arsenal. After six Premier League matches, Eddie Howe’s side have managed just one win and sit 15th in the table.