Given that the knee in question is noted as the other one to that which gave him issues at his time at the Storm and his first couple of months with us, an exemption wouldn't be out of the realms of possibility at all.
Given we do have, though not ideal, options in the centres in the interim (To'a, Doueihi, Faataape, Turuva, Skelton, Naden on return), the potential to regain another 600 to go to market for a centre would be the best outcome.
Couple that with the spare dollars spoken about of late and the (likely) moving of Klemmer, that's a fair chunk back in the pocket to grab a highly quality centre and (hopefully) chase a quality edge also. Would really start to even out the squad if it plays out that way.