Eh, our bench has 5 spots, I think there is room to store 1-2 injured players but it is cutting it close for a later season run. If your team can stay in contention til then (Feb or March) then you're good to go.
To be honest, the roster we use is so small and there are so many good FAs left and there will be much more that rises as the season progresses that a bad roster isn't going to hit you hard since you can adjust easily and store them in the bench. There will be a lot of regretful nigths where we go "Fuck, I should have put _____ over _____ in the line-up tonight because he did better!".