The NFC West side signed the 32-year-old, who is competing to be the number three cornerback for the team, as a free agent earlier this year.
Fangio told the team's website: "He's done well in his reps that he's had in the game and in practice. Particularly the last two or three weeks, he's played much better.
"He's still playing at a good enough level to be a major part of our defense. If he's the third corner, he's going to get somewhere between, if you use the last two years as a barometer, 50 and 65% of the snaps. That should be a good enough gauge."