The race for Dundee United midfielder Stuart Armstrong is heating up.
Crystal Palace and Hull City have been linked with Armstrong, while Celtic are also interested.
The Daily Mail says Parkhead boss Ronny Deila, who is seeking between two and four new faces in the January transfer window, wants midfield reinforcements ahead of an assault on the last 32 of the Europa League.
Armstrong features high on a list of potential transfer targets compiled by the champions.
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