All his talk at the start of the year , he has had a good preseason wants his Origin spot back , blah blah blah . I'm sure the medical staff would have explored all avenues if they thought it was medically related . First run of the game last week plodded up like an old draught horse . If he doesn't pull his finger out this week he better be shaking hands with RonnyIt does sound like Dan might have some medical issue, and after effects of covid would be one thing a doctor would look at - but there are dozens of things from low iron levels to gluten intolerance to early stages of diabetes to low vitamin D levels etc etc etc that could cause fatigue. Most of those things are easily diagnosed and treated.
I assume all the players have regular physicals to check for all those things, but maybe Dan needs to get tested for some less likely causes.