He has since undergone surgery and his rehabilitation has included a progressive running programme that was conducted by Ulster physiotherapist Alan McCaldin on an AlterG treadmill.
The anti-gravity running machine controls the pressure exerted on the body, allowing Ferris to load his knee with up to 100% of his bodyweight.
National and provisional physio and strength & conditioning units have agreed on a planned programme for him which was devised by Ulster strength & conditioning coach Jonny Davis.
The programme is based on a comprehensive analysis of GPS data to determine appropriate volume and intensity of sessions - global positioning systems track player movements on the pitch.
The 25-year-old back rower is hoping to prove his fitness ahead of Ireland's GUINNESS Summer Series matches next month.