Irving left Sunday's game against the Colts with a lower leg injury, and he is questionable to return, the Denver Post reports. The Broncos are already thin at linebacker, with starting weak-side man Danny Trevathan (knee) expected to miss at least the first few games of the season. Irving, the starting inside linebacker, is followed on the depth chart by Steven Johnson, and then Lamin Barrow. Irving had a nice stat line at the time of his exit, with four tackles (three solo), a sack and two TFLs.