Apart from Joe Gomez's injury last season, they rode their luck and then some with injuries. They wont repeat the trick this season.
Yes some yank on commentary was singing Klopps praises saying that Gomes had only been given 4 days rest off by the club in the close season. There's lots to praise Klopp for but thats just utter idiocy. As was bringing Mane on yesterday after 3-4 days training. He will be starting next week. He's nowhere near ready to start and there was no need for him to be involved yesterday.
Certain players he has had his impact upon, Lallana and Sturridge come to mind. I think you will see more of it this season (my prediction is Firmino will break down) and potentially this is what Alisson has suffered from. There will be the usual narrative of bad luck when it happens, but it's not bad luck, it's bad management, as it was at Dortmund when a squad was gutted by such an approach. Sarah should have been off last night on 55 and Mane rested the entire game.
I'll await to see what the Alisson injury is, it looked innocuous but it would come as no surprise to anyone if he was carrying an injury but was pushed through the pain barrier by Mr against modern football (so against medical advise on players). If such things are true, you can't bemoan luck, it's just utter stupidity.
The only thing I'd add re Alisson, is if he has done his achilles that is potentially a horrendous injury to do for a goalkeeper. All your power to spring for dives, crosses and coming off your line are impacted upon. Like Yakubu he will not be the same again if there's an injury to that.