This has been a troubling week for the Bills, thanks primarily to the torn bicep suffered by linebacker Matt Milano that will keep him sidelined likely into December.

And then during the game, backup quarterback Mitchell Trubisky suffered a knee injury that prevented him from finishing the first half.

Mitchell Trubisky injury update

There won’t be any update on the severity until at least Sunday, maybe Monday, but if he’s going to miss time, the Bills will be scrambling to find a backup because Ben DiNucci can’t be the No. 2.

Who is Mitchell Trubisky's backup on Buffalo Bills depth chart?

I saw on X a few people pleading for the Bills to give veteran free agent Ryan Tannehill a call, and that was before Trubisky got hurt because they were irritated with how Trubisky was playing.

The 36-year-old Tannehill is on the open market and is by far the best remaining available quarterback without a team, but that's not really an option because Tannehill is not going to want to come to Buffalo to backup Josh Allen, one of the most durable QBs in the NFL.

I'll have a full story on the backup QB situation Monday morning.

Sal Maiorana has covered the Buffalo Bills for four decades including 35 years as the full-time beat writer for the D&C, and he has written numerous books about the history of the team. He can be reached at maiorana@gannett.com, and you can follow him on Twitter @salmaiorana. https://profile.democratandchronicle.com/newsletters/bills-blast

This article originally appeared on Rochester Democrat and Chronicle: Mitchell Trubisky injury: Bills QB exits game vs Steelers