Coach Joe Philbin was asked what Garner needed to do to make himself a contender for the starting job.
"He is a contender right now," Philbin replied. "He's got a lot of snaps in. We know a lot about him. He's very versatile. He fills a lot of roles, at times we've been competing. Again, our philosophy is we are going to find the five best guys and line them up get them ready to go. Right now, we aren't exactly sure who those five guys are, so he's absolutely in the competition at this time."
Garner first joined the Dolphins in 2008 after being claimed off waivers from the New York Jets, making him the longest-tenured member of the offensive line.
Garner has started 13 games for the Dolphins, including four at right tackle last season after Jake Long was injured and Jonathan Martin was switched to left tackle.
In addition, Garner started eight games at guard in 2009 and another one in 2011.
The summer began with the right guard job expected to be disputed between incumbent John Jerry and free agent pick-up Lance Louis, but Jerry has been out for a couple of weeks and Louis has yet to fully work his way back from the torn ACL he sustained while with the Bears in 2012.