Celtic will have to leave at least one of their new first-team signings out of the squad to face Bodo/Glimt in the Europa Conference League.
And Ange Postecoglou will have to decide tonight on which of Reo Hatate, Matt O'Riley, Daizen Maeda or Yosuke Ideguchi will miss out.
Those four along with B-team striker Johnny Kenny completed Celtic 's January business as Postecoglou added significant depth to his squad.
However UEFA rules mean that only three new players can be added to the squad ahead of the knockout stage - which kicks off for Celtic against Bodo/Glimt on Thursday 17 February.Osaze Urhoghide, Liam Shaw, Adam Montgomery and Ewan Henderson have freed up slots in the squad as they headed out on loan last month, though some occupied B-list places.
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