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The Dolphins got a scare Thursday morning when Ryan Tannehill's left knee buckled during practice. But they subsequently received good news.

Tannehill has no structural damage to the knee, according to Aditi Kinkhabwala of NFL Network.

Tannehill walked off the field after suffering a non-contact injury to his left knee. There were fears that it could have been a serious injury. Tannehill missed the final three games of the 2016 regular season and the Dolphins' wild-card loss to the Pittsburgh Steelers after suffering ACL and MCL injuries in the same knee.

Instead of surgery, Tannehill had a healing procedure done by Dr. James Andrews a few weeks following the injury and all offseason the Dolphins and Tannehill have insisted his knee was stable.

"Just so everyone hears, the knee is really good. It feels really good," he said just last week, via the team's official website. "I haven't had any changes since the spring. I was a full participant in the spring and still going really well. Now we don't have to address that anymore, right?"

As Profootballtalk.com's Michael David Smith notes, today's injury set off immediate speculation that the Dolphins could make a major move at quarterback, such as signing Colin Kaepernick, trading for Brock Osweiler or coaxing Jay Cutler out of retirement.

But it appears none of that will be necessary, and Tannehill will be good to go.

For what it's worth, Matt Moore is still the Dolphins backup. The soon-to-be 33-year-old started four games for Miami in Tannehill's stead last season. While Moore remains a competent backup, if Tannehill misses any significant amount of time, it's a massive blow to the Dolphins' playoff chances.

Head coach Adam Gase is a quarterback guru, but playing 16 games with a limited Moore is not what he had in mind entering Year 2.