Leicester City scout Sean St Ledger watched Celtic beat Lazio 2-1 in the Europa League on Thursday evening.
The former centre-half is a Senior Scout at City and the Daily Mail report that he was at Celtic Park to watch defensive target Kristoffer Ajer.
Reports have suggested that Leicester want to sign a central defender in January if they can find value in the market, and Ajer certainly fits the bill.
The 21-year-old has made 90 appearances for Celtic and has won six trophies during that time. He also has 12 caps for the Norwegian national team.
Wes Morgan’s contract is set to expire in the summer and Filip Benkovic will be allowed to leave on loan if a replacement can be acquired in the winter market.