By Craig Hope for MailOnline
Published: 09:29 GMT, 14 February 2020 | Updated: 13:00 GMT, 14 February 2020
A mystery injury has cast doubt on Andy Carroll's Newcastle future with the club unable to determine what the problem is or when he will return.
Sportsmail revealed in November that the striker was suffering from a problem around his ribs, and that has since been labelled a 'hip' issue by boss Steve Bruce.
However, Bruce now says the injury is not his hip and, despite their best efforts, they have failed to get a diagnosis.
A mystery injury has cast doubt on Andy Carroll's Newcastle future with the problem unclear
Carroll did return from a brief lay-off to feature in seven games over December and early January but has now been sidelined for a month and will miss Sunday's trip to Arsenal.
'The frustration for us all is that, just as we thought we were getting Andy back with those seven games, unfortunately he volleyed a ball in training and hasn't been the same,' said Bruce, who has