The shot stopper was hurt on Saturday in a 3-0 defeat to the Congolese side and was stretchered off late in the match.
Ochan will miss the return leg and can only return after a couple of weeks.
“The pain has reduced, which is a good sign and he can now walk with ease,” said SCVU physio Ivan Ssewanyana.
“We shall assess him and see how he progresses. I just cannot confirm for how long he will exactly be out.”
Yasser Mugerwa was another causality from the confederations cup engagement after he suffering an ankle injury.