Tagovailoa is dealing with a tight back, according to Adam Schefter of ESPN.
Per Schefter, Tagovailoa's back issue isn't viewed as serious and the QB should be able to return next week. With Michael Penix (knee) not yet ready for team drills and Trevor Siemian no longer in the mix, the Falcons are signing Cooper Rush to add depth to a signal-caller corps that also includes rookie Jack Strand.