The former Leeds, Tottenham and England man will be unavailable for the rest of the season but has returned home after spending the weekend in hospital with respiratory problemsBlackburn Rovers goalkeeper Paul Robinson has been ruled out of action for six months after a blood clot was found in his lung.
The former England international was diagnosed with a pulmonary embolism after developing respiratory problems following a back operation, the club has confirmed.
Robinson is now at home, having spent the weekend being monitored in hospital, but is likely to miss the start of next season.
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Kean requires an operation on his left knee after tearing cartilage during the 3-0 defeat to Cardiff on Monday and will be out for six weeks, leaving Grzegorz Sandomierski as the club's only available keeper.
Rovers are currently 19th in the Championship with six games remaining, level on points with Huddersfield, who occupy the final relegation spot.