HITC Sport understands Partick defender is weighing up an offer from Belgian club.
Frans is out of contract at Firhill next month and Patrick have offered him a new deal to keep him at the club.
However, several other sides have expressed an interest in signing the centre-back on a free transfer this summer with Antwerp tabling an offer for Frans as they look to lure him back to Belgium.
Frans has established himself as a key player for Partick after initially joining the club on a short-term contract in October 2014.
The former Belgium under-20 international quickly impressed at Partick and was rewarded with a new 18-month deal just two months after arriving at the club.
Partick boss Alan Archibald is keen to keep hold of Frans as they look to build on securing a fourth successive season in the Scottish Premiership.
However, Frans is refusing to rush into a decision and is currently back in his homeland of Belgium to consider all the offers that have come his way.