The Falcons placed Hayes (undisclosed) on the practice squad injured list Tuesday, Terrin Waack of the Falcons' official site reports.
The severity and nature of Hayes' injury isn't clear, but his placement on the practice squad IL means he won't be eligible to be elevated to the active roster for at least the next four games. That makes Week 12 against the Saints on Nov. 23 the earliest he could be elevated.