Frey faces long wait on sidelines
Fiorentina have suffered a huge blow with goalkeeper
The 30-year-old was hurt in training on Tuesday and underwent tests today which confirmed the club's worst fears.
A statement from the club read: "The tests done have shown damage to the anterior cruciate ligament.
"The player will need to undergo surgery. The time for a complete recovery will vary between four and six months, depending on the surgery he will need."
The Frenchman's injury is another blow for Fiorentina, who are already without star striker