Speaking to sydneyswans.com.au, head of physiotherapy and medical services Damian Raper provided an update on both players and the layoffs they face.
O'Riordan suffered an eye injury in the opening game against the Bulldogs, while Fox injured his hamstring in the first half of the VFL clash.
"Colin unfortunately suffered a poke to his eye during the VFL game on the weekend. He will need a couple of weeks to get his vision cleared and checked by the specialists," Raper said.
"Robbie Fox was playing well in the VFL game, but unfortunately while sprinting during the second quarter he suffered a hamstring strain. He will miss a couple of weeks while he undergoes rehabilitation for that injury."
"Justin McInerney missed last week with his knee sprain, he's progressing well and will be a test in training this week," Raper said.
Star small forward Tom Papley is continuing to recover from a hamstring injury that has caused him to miss the opening rounds of the season. The Swans will be looking forward to Papley's return for more firepower in their exciting forward line.
"Tom Papley is progressing well with his hamstring rehab as per our current plan, we're happy with his progress at the moment," Raper said.
John Longmire's side will face a slow-starting Bulldogs side tomorrow night at Marvel Stadium, with the Dogs welcoming back star midfielder Bailey Smith and getting the all-clear for talented spearhead Aaron Naughton to take to the field in a must-win clash.