Kanu has departed
Birch has warned unless the club's remaining senior players either reached agreement over unpaid wages or left the club, Pompey will go out of business.
"There are substantial sums in there, but they have made compromises to leave the club with years left on their deals. They have also agreed for their deferrals to be paid over a certain period of time.
"It's a terrible time for everybody, but they have helped the club and I'm sure fans will thank them.
"That means there are now three players left because Kanu effectively walked away at the end of last week after submitting his 14-day letter.
"He is still claiming, however, so we will file a submission to the Football League, with it going to a tribunal hearing to decide on the issue. Hopefully they can hear it as quickly as possible."
A late equaliser from Miguel Caneo earned Quilmes a 1-1 draw against Argentine Clausura leader Newell's Old Boys while Boca Juniors accounted for Colon.