Murphy was injured in the defeat to Dublin at Croke Park last weekend
Doctors at the Sports Surger Clinic in Dublin did carry out tests – but ruled out the need for surgery.
Surgeon Ray Moran has ruled out a return for the league game against Armagh, putting the Glenswilly player on a six week rehab programme.
Doctors found that the DCU student didn’t sustained any damage to his cruciate or knee cartilage.
In January, Murphy had a corrective procedure to cure a groin injury.