Veteran offensive lineman Allen Barbre was placed on injured reserve with an undisclosed injury, while undrafted rookie guard Tyler Donahue, who was just signed on Aug. 21 after initially spending time with the Rams this summer, was placed on waivers.
The Dolphins conclude their preseason schedule Thursday when they host the Dallas Cowboys. Two days after that, they will have to make their big decisions by cutting down to 53 players by 6 p.m. Saturday.
It's no surprise to see either of these guys, nor is it surprising that both of Tuesday's cuts are offensive lineman. Even after the departures of Barbre and Donahue, the Dolphins have 14 offensive linemen under contract competing for what will only be eight or nine spots.
Barbre had primarily been working at left tackle behind Lydon Murtha in Jake Long's absence, although he had missed time due to injury recently and didn't play in last Saturday's game against Tampa Bay.
Signed to a two-year deal just before the end of the 2010 season, Barbre's versatility and experience (28 games, seven starts in four seasons) made him a potential backup candidate.
However, he has largely been a disappointment since the Packers drafted him in the fourth round in 2007 and was always a long shot to stick around in Miami.
Meanwhile, Donahue makes it just nine days on the Dolphins' roster, which should come as no surprise given his limited physical tools and ability. He was a solid starting tackle in college at Bowling Green, but he projects at guard in the NFL and even there will have a tough time ever making it at the professional level.
Considering Donahue's lack of upside and the fact that he didn't even survive to the final round of cuts on Sept. 3, you can pretty much write him off as a practice squad candidate as well.
Barbre's departure means rookie D. J. Jones will remain a backup left tackle for the time being, although he probably won't make the final roster.
Donahue leaving likely means Ray Feinga will work as the second-team right guard behind mega-disappointment John Jerry, with Matt Kopa and Garrett Chisolm (activated from the non-football injury list Monday) backing up left guard.
As always, check out the updated projected depth chart reflecting these transactions here.
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Chris J. Nelson majored in journalism at Georgia State University and currently works for Turner Sports in Atlanta. He operates his own Miami Dolphins website, The Miami Dolphins Spotlight, and he can be followed on Twitter here.