Hoop Blah Losing Fabinho for 6 weeks, and a very busy 6 weeks at that, will be a bit of a test for Liverpool. Henderson, Wijnaldum and Milner can all play that role, and I believe Lallana has been doing it this season too, so they have options who can cover him, but not as well as he's done the job for the last 12 months.
It might test that back for a little more without his extra defensive cover.
IIRC they’ve got a pretty straighforward run in coming up so it’s not the end of the world for them. It’s a big chance for Keita, Shaqiri and Lallana to stand up now if they can avoid the injury table