The Bhoys have had a disastrous season in Europe, but are pushing ahead to win a fifth straight Scottish Premiership title, even with pressure on manager Ronny Deila.
Deila may now consider big January transfers, and the Daily Mail report that Celtic are pursuing another Croatian prospect in Rijeka's Ivan Mocinic.
Celtic swooped to sign Dinamo Zagreb defender Jozo Simunovic, and after his initial success in Glasgow, it seems that the Bhoys are looking to bring in another Croatian.
22-year-old midfielder Mocinic is one of the most highly-rated players in Croatian football, and has picked up one cap for the national team - though competing with players like Luka Modric, Ivan Rakitic, Mateo Kovacic and Marcelo Brozovic for caps is always difficult.
With 125 appearances for Rijeka, Mocinic has plenty of experience behind him even at 22, and with a strong passing range, he could slot in to the Celtic side in front of the back four if the Bhoys can secure a £2.5m deal next month.
It's stated that, with Celtic now pursuing a January deal for Mocinic, they are cooling their interest in Dundee United's Scottish 19-year-old midfielder John Souttar, who is out of contract at the end of the season.
Meanwhile, the report also notes that Deila remains a big fan of Eintracht Braunschweig striker Emil Berggreen as an alternative to Aston Villa target man Libor Kozak, with Celtic seemingly targeting a more physically imposing striker next month.