Even I'm a huge Djokovic fan, but I don't think this injury is as serious as some think it is.
Is there an injury? Yes. He isn't faking. But if he can grind and baggel opponents like he did in the 1st 2 rounds, it can't be that painful.
He was struggling during his practice with Medvedev and was fine against RCB. Struggling again against EC so who knows about the next round. Nobody knows how this match will play out. With 48h of rest, a bandage and some painkillers, maybe he'll be ready.
Even if he's injured and plays agressive/relaxed like he did today, I'm not sure guys like Dimitrov or De Minaur can beat him.
And I doubt it will be a day match. The top seeds in this part of the draw (Ruud, Fritz, Zverev) are all gone. I doubt Rune/Humbert or De Minaur/Bonzi would get the NS on the RLA. Tiley wants to bring as many people as he can for these NS.