The injury occurred in the first round.
Koscheck (15-5) was released from a Montreal-area hospital Sunday afternoon, according to his trainer, Bob Cook. He cannot fly home to San Jose, Calif., because an air pocket formed behind the broken orbital bone, making air travel dangerous. UFC officials arranged for Koscheck and Cook to drive Sunday afternoon from Montreal to Boston, where the 33-year-old fighter is expected to undergo surgery Monday or Tuesday.
"We're going to have a much better sense of the injury when we get to the States," Cook said. "We'll get it checked down there. Hopefully he can have the surgery there and head home as soon as possible."
St. Pierre battered Koscheck for five rounds, winning a unanimous decision to retain his UFC welterweight championship. Koscheck was seen in his corner between rounds four and five refusing treatment on the eye, which was badly swollen.