Alan Curbishley said: "He's been very sore ever since the tackle. After the Everton game we had it scanned and it revealed that he has picked up a fracture."
"Gonzalo has had a disastrous time of it. We had only just got him back from a hamstring injury, which is why I was so angry with it all.
Jerome Thomas (virus) is out. Meanwhile, Talal El Karkouri has left for the African Nations Cup.
"Jerome is back in full training but he was quite badly ill, so he's still a way off," added boss Curbishley.
The manager also confirmed that Danny Murphy, who emerged from the Everton defeat with a sore hamstring, trained on Friday.