According to Reid:
Brennan aggravated a hamstring injury and also injured his knee while being sacked late in the fourth quarter of Thursday's 24-17 loss to the Jacksonville Jaguars at Jacksonville. Afterward, Brennan said the injuries were not considered serious.
In examining Brennan's left knee and hamstring, however, Redskins medical personnel apparently expressed further concern about a left hip injury that occurred Aug. 13 against the Baltimore Ravens at M&T Bank Stadium. In April 2008, Brennan had surgery to repair a slightly torn labrum in his right hip.
Reid then made the logical assumption that with Brennan out for the season, Chase Daniel would take his place on the 53-man roster. But that doesn't appear to be the case, as the Redskins, according to ESPN, have decided to keep just two quarterbacks on the roster.
Daniel says that even though he won't make the Redskins' final roster, the Redskins have told him that if he clears waivers he will be named to the team's practice squad.
As for my take, if the Redskins do decide to keep two quarterbacks on the roster for the time being, I don't mind that at all. It's very rare that a team uses all three quarterbacks during one game, so if something happens to Jason Campbell or Todd Collins, the team could promote Daniel if he is named to the practice squad. Or, if further injuries occur, the team could pursue another quarterback option elsewhere. Also, one less quarterback on the roster means the team can carry another player at another position.
Update: According to Reid, Brennan had been hampered by a left hip injury since the team's first preseason game against the Ravens.