Wat? Premier League champions 2x in a row maybe, but impossible for back to back CL wins seeing as Bayern won it last year and my money is on them again. Liverpool have a lot of injuries right now.
I don't think they can pull it off without Mohamed Salah, he has Covid and is quarantined in Egypt so he can't travel anywhere for matches. He'll probably be back this Thursday according to the news but Liverpool is lucky that it happened during the international break and not before critical UEFA matches.
The question will be whether Covid will affect the medium and long-term performance possibility. Since Ronaldo fell victim to Covid, he has not performed as well as before. There are many Covid patients who still complain of breathing problems and neurological problems even after months. Why should it be any different with professional players. For some professionals who were infected with Covid, it could even mean the end of their careers. In my opinion, this is given far too little attention in discussions.
You have a point, according to this August study, 55% of all recovered Covid patients have symptoms of fatigue and dizziness and it has must have hit it's fair share of professional players as normal people.
It could force a few older players into retirement and the transfer value of younger players will go down as they perform worse in future games. It's a net loss to all clubs, as clubs which don't win games much have their market value lowered.
Next question is how long these effects last, whether for a few months or several.
I wouldn't pay that much attention to these 'studies'. Fatigue is normal after things like a cold of the flu but I'm sure 'Covid fatigue' will become the new I'm too ill to work excuse so people can enjoy early retirement and a lifetime of benefits. I'm sure professional athletes being paid millions will be seldom effected . In the cases of people like Ronaldo and Salah they're asymptomatic and have only tested positive for the virus whilst having no problems or symptoms whatsoever. This will be the case for most people I think, or those tests they're giving people are issuing false positives which is what Ronaldo claimed I believe.