The centre-back was forced off the pitch on a stretcher during Hearts' 3-1 defeat by Dundee United on Saturday after his ankle took his whole weight when he landed awkwardly following an aerial challenge.
Manager John McGlynn told Hearts TV: "He got a scan and it was bad news. He has torn a ligament completely and the other ligament is hanging by a thread, according to Rob Marshall, our physiotherapist.
"We have to wait for a specialist to see where he goes with Marius and what the next stage is.
"He is going to be out for a couple of months at least, I would expect.
"It's not been totally confirmed but I don't think he will be back any earlier than that."