Chelsea winger Charly Musonda is a target for Celtic.
Bournemouth and Nottingham Forest are among the English clubs to have asked about the 21-year-old but the Scottish champions are willing to loan or buy if the price is right.
Celtic also like Chelsea's Lewis Baker who has been on loan at Middlesbrough but may be recalled this month.
Meanwhile, Crystal Palace have made enquiries about Celtic striker Moussa Dembele who remains unconvinced about a move to Brighton.