Not when you consider his knees are f***ed.
If the lad has any sense he'll be conditioning his lower, not his upper body.
Actually that's not completely true. If you have ligament damage the last thing you want is excessively strengthening the muscles that insert themselves into such ligament too early. Although increasing your bodyweight isn't advisable either (I f***ed up my knee ligaments when I was 16).
Anyhow, I expect his fitness is monitored by the club doctors, don't think he has went on a weight lifting rampage by himself.