PHOENIX — Matt Moore stood on the sidelines the entire way Sunday, conferring often with Miami’s offensive coaches but not playing in the Dolphins’ 24-21 overtime loss to Arizona at University of Phoenix Stadium.

The five-year pro from Oregon State is backup quarterback to rookie starter Ryan Tannehill, who had the game of his young career, throwing for 431 yards in the loss to the 4-0 Cardinals.

Moore started 12 games for Miami a year ago, but when the Dolphins took Tannehill in the first round in the April draft, it was only a matter of time before the former Texas A&M standout would assume a starting role.

With his college coach — Mike Sherman — Miami’s new offensive coordinator, it was going to happen sooner rather than later.

“Naturally, you’re disappointed,” said Moore, 28. “But I’ve been a backup for most of my career, and I’ve played and started a lot of games (25, including at least one in each of his four previous seasons). It’s a role you have to understand. You have to approach it with the right mindset. I think I have that.

“I believe I still help this team in a lot of ways. The key is to be ready to play if my number gets called. Hopefully it doesn’t come to that. Ryan is playing his rear end off. He has a bright future. He’s extremely advanced compared to a normal rookie. But I’ll be ready if need be.”

Moore was a fixture on HBO’s “Hard Knocks” reality series involving the Dolphins this season. One of the scenes featured Moore being told they were going with Tannehill as the starter to open the season. He handled it with aplomb.

“That was a little crazy, but it was something fun to do,” he said. “You spin it as a positive. People out there who don’t know me personally get to see my character and who I am.”

Moore invariably wore an Oregon State baseball cap during the taping of “Hard Knocks.” He is a proud Beaver alum who watched on television the wins over Wisconsin and UCLA.

“I couldn’t get the Arizona game, so I listened to Mike Parker on my iPad,” Moore said. “It was a great win. They have something good going. The defense stands out to me. With (quarterback Sean) Mannion playing the way he is and two guys outside in (Markus) Wheaton and (Brandin) Cooks, they’re looking good. Makes you proud to be a Beaver.”