Originally Posted by stoffe
Since Revan likely is more than 30 years old at the time he might have met Revan as a child or teen in the order, and somehow remembered and recognized her?
Or he recognized Revan from her last visit to Kashyyk, when she came there with Malak to find the Star Map?
Or the classic plot device: the Force told him.
Overall the time line presented in KotOR is so full of contradictions and inconsistencies it's near-impossible to piece together exactly how things fit together.
FYI, Revan is canonically a male, not a female.