ALAMEDA — The Raiders want no part of O.co Coliseum heading into the future, but the home stadium has provided the closest thing to a comfort zone for their quarterback of the future.

The Raiders have won their last two games at home, 24-20 over the Kansas City Chiefs and 24-13 against the 49ers, the first two victories in the career of rookie second-round draft pick Derek Carr.

The Coliseum is where Carr has thrown 11 touchdown passes with five interceptions and a passer rating of 86.5, as opposed to six touchdown passes with five interceptions and a passer rating of 69.8 on the road. (One game was played on a neutral site in London).

Carr has been sacked just three times in six games at the Coliseum, 16 times in seven games on the road.

So it stands to reason Carr will be supremely confident Sunday when the Raiders host the Buffalo Bills (8-6) at the Coliseum.

Except, of course, that if Carr admitted he was more relaxed and effective at home, it would be tantamount to admitting he is unsure of himself on the road. So Carr won’t buy in.

“I always feel confident,” Carr said Wednesday. “There is never a time in any game that I’m not confident in myself or our abilities as a team. So I guess it has just worked out that way.”

Carr will concede there is a difference in the way the Raiders play at home and on the road.

“Obviously we play with a lot of passion and energy at home, and that’s something we obviously need to learn to do on the road,” Carr said. “We’ll have one more shot (on the road), but we’re really focused on Buffalo and hopefully we’ll have another good week at home this week.”

Raiders interim coach Tony Sparano is also reluctant to say Carr and the offense are better at home, but does concede, “sometimes you get on the road and a really loud environment and they can get kind of a little jump on you there, but I view those things as excuses.”

Carr was limited Wednesday with a sore right thumb, but that didn’t seem to affect his comfort level, either. Carr wore no brace, and the thumb didn’t appear swollen while talking to the media following practice.

Sparano, when asked if he was concerned, replied, “No, not from what I just watched.”

The reality of the Raiders’ situation is that a lot of the things could change for Carr next season in terms of his head coach, assistants and style of offense.

If Carr had a vote, and he admits that he doesn’t, it would be to bring back Sparano, as well as offensive coordinator Greg Olson and quarterbacks coach John DeFilippo.

“The fact is, I don’t know what’s going to happen, and that’s hard,” Carr said. “I am focused on playing my heart out for him, because I love him to death. He pushes the heck out of me, and that’s how I liked to be coached.”

Ray-Ray Armstrong, the weak side starting linebacker against Kansas City in place of Sio Moore, credited Moore and Miles Burris with helping him get prepared for his first NFL start. “It’s great to have an opportunity, but it’s what you do with it,” Armstrong said. “I’m trying to make the most of it and help my teammates out.” Sparano praised Armstrong for his performance. He declined to say whether Moore, placed on injured reserve with a hip injury, would require surgery.

Cornerback Chimdi Chekwa (hamstring), tight end Brian Leonhardt (concussion), wide receiver Denarius Moore (knee/ankle), tackle Menelik Watson (foot/ankle) and defensive end C.J. Wilson (knee) and cornerback Tarell Brown (foot) did not practice.