Bradley has suffered a significant knee injury involving bone and ligament damage, reports BBC Sport.
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The result is that Bradley has been ruled out for the remainder of the season. However, there is hope he will be fit in time for Northern Ireland's World Cup qualifying playoff.
The defender suffered the injury during the 0-0 draw at Arsenal in midweek, Bradley fell awkwardly in injury-time when chasing the ball.
It's reported the setback is not related to Bradley's previous ACL injury. He is scheduled for surgery in the coming week.
