The midfielder suffered the injury in training on Thursday and the extent of the damage will not be known until the weekend.
Steve Bruce revealed: ‘Unfortunately, Sean Longstaff turned an ankle in training and won’t be in contention for the weekend. We won’t quite know how serious it is for another couple of days, but it’s a blow for us.
‘It’s one of the awful ones. He goes to stop a cross and gets his ankle caught. It’s one of those freak ones that unfortunately happen.
‘You come off the pitch and we’re all disappointed. We’ve lost a player to a freak accident but that’s what happens in football.’
Meanwhile, Andy Carroll will miss the return to his former club as he continues his recovery from ankle surgery and the striker was expected to see a specialist yesterday.
‘For everybody to see him joining in (training this week), it was good for him and good for the group’ said Bruce.
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