Celtic face fight to hold onto star as cash-rich Champions League side set to up offer
The 24-year-old is wanted by Lille who are looking to recruit ahead of their return to the Champions League after finishing second behind Paris Saint-Germain in Ligue 1.
Having amassed a massive £72million following Nicolas Pepe's move to Arsenal, the French side are set to up their bid for Simunovic, according to the Daily Record.
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Hide AdCeltic are believed to have previously knocked back a bid of £4million from Lille.
Les Dogues, managed by Christopher Galtier, have been busy in the transfer market, adding ex-Celtic player Timothy Weah as well as a couple of young centre-backs.
However, with Simunovic's European experience with the Parkhead side, Lille see him as a key transfer target.
Contracted until 2021, the Croatian has been an important player for Neil Lennon, forming a robust partnership with Kristoffer Ajer last campaign.
He has played all four Champions League qualifiers so far this season and it is believed it will take a huge offer to prise him from Celtic.