Jackie McNamara is in hospital after the former Celtic captain collapsed near his home in York on Saturday.
McNamara, 46, returned to Dunfermline Athletic as a consultant last year, having started his playing career at the Pars.
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The defender won four league titles at Celtic and won 33 Scotland caps. He also played for Wolves, Aberdeen, Falkirk and Partick Thistle.
As manager, he worked at Thistle, Dundee United and York City.