It has become clear that Andrew Luck's shoulder is injured, though the extent of it isn't exactly known.
Earlier in the week, it was reported that Luck suffered a subluxation in his throwing shoulder —a "lesser" dislocation — but a Colts source denied the report, and Chuck Pagano continued to say Luck just had a "sore shoulder."
Things became a little clearer when the Colts re-signed backup quarterback Josh Johnson, who they had cut two days ago.
While it's still not exactly known what's wrong with Luck, it's serious enough that the Colts are starting backup quarterback Matt Hasselbeck (who started Week 4, too) over him. However, the 40-year-old Hasselbeck isn't in great shape, either.
Hasselbeck reportedly went to the hospital after last Sunday's game, and got an IV for a virus he was dealing with. Adam Schefter reports he was there as recently as Tuesday.