I woulf do an internal bracing using dynamic intraligamentary stabilisation ( Ligamys), thereafter an early functional physiotherapeutic training, without kneeflexion over 90 degrees!

Reconstruction and bracing on the orthopaedic side; Honesty on the psychological side

One stage ligaments reconstruction in order to achieve early mobilization and avoid stiffness.

If you are at a hospital that can support 1) the prolonged OR time, 2) two Allografts (for ACLR, and PCLR), and 3) good surgical assistants acutely, I would reconstruct both cruciates with allografts and primarily repair the MCL with augmentation using internal suture bracing. If you are at a smaller facility, then you might need to just reconstruct (or repair) the PCL and repair the MCL first, start CPM and ROM brace, and come back at a later date for the ACLR.

Fair-Poor prognosis for returning to professional football.

I would decide Jerome Enad's answer ☺

One Stage ligament reconstruction

At first you have to be sure there is no injuries due to a luxation (you have to check the arteries, high risk of postop. compartment syndrome!).

Then I would reconstruct the MCL with internal ligament bracing (suture tapes with anchors if available). If PCL is completely instable and you have enough OR time, then I would recommend to reconstruct the PCL with Quad tendon in one session. Otherwise you can stabilize the PCL with a brace.

I do not think that full ligament repair of MCL + PCL + ACL in one session is recommended.

And what about cartilage an meniscus??