"I've just been going out and just working each day," he said Wednesday, according to The San Francisco Chronicle. "I know my abilities, I know I can help the team. ... It's just letting everything unfold, playing as best as I could."
Asomugha, once considered one of the top cornerbacks in the NFL, signed with the 49ers this offseason after his release by the Philadelphia Eagles, just two seasons after signing a five-year, $60 million contract.
Earlier this month, 49ers defensive coordinator Vic Fangio questioned whether the 32-year-old Asomugha could help the 49ers after his two disappointing seasons with Philadelphia.
"We really didn't now what we were getting when we got Nnamdi," Fangio told reporters, according to CSNBayArea.com. "He's had some good days out here and some days when we weren't sure if he'd be able to still have it. I think we're kind of in between on him right now. Hopefully, he'll still be able to have some gas left in his tank to go out there and play like he did prior to going to Philadelphia. So I think the jury is still out there."
But Asomugha has impressed Fangio with his work in training camp and the 49ers' preseason games, where he has allowed just one catch for five yards in 39 snaps.
"He's done well in his reps that he's had in the game and in practice," Fangio told reporters Wednesday. "Particularly the last two or three weeks, he's played much better."
Asomugha has passed Tramaine Brock on the depth chart as the third cornerback behind starters Carlos Rogers and Tarell Brown. He will fill the role of cornerback Chris Culliver, who will miss the season with a torn ACL.
"[Asomugha's] still playing at a good enough level to be a major part of our defense," Fangio told reporters. "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 percent of the snaps. That should be a good enough gauge."