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Report: 49ers sign center Alex Mack for $5.5 million

John Lynch and Kyle Shanahan have solidified the offensive line.

Photo by Jonathan Bachman/Getty Images

Kyle’s update, 1:39 p.m.: There aren’t full terms to Mack’s deal yet, but I’d bet it’s a one-year deal worth $5.5 million. Mack is an ideal stopgap for San Francisco at center.

It’s been an interesting few days for the San Francisco 49ers.

Shortly after re-signing All-Pro left tackle Trent Williams, general manager John Lynch, and head coach Kyle Shanahan kept busy by signing free-agent center Alex Mack.

The 35-year-old Mack played the last five seasons for the Atlanta Falcons. Pro Football Focus gave Mack a 65.9-grade last season, which ranked 16th out of all NFL centers.

Mack fills a gigantic hole for the 49ers, who had major question marks on the offensive line's interior going into the offseason. Weston Richburg underwent hip surgery, which will likely keep him out for a prolonged period. San Francisco restructured Richgurg’s contract to add some financial flexibility this offseason.

General manager John Lynch has been busy before the official start of free agency. The Niners locked up Williams and have inked Kyle Juszczyk, Jason Verrett and Emmanuel Mosley to new contracts. The 49ers also signed pass-rusher Samson Ebukam to a two-year deal worth up to $12 million.

Mack is familiar with Shanahan’s system. The duo spent three seasons together, including the 2016 campaign when Mack was named to the Pro Bowl while with the Atlanta Falcons.

It looks like San Francisco’s starters on the offensive line will be Williams, Laken Tomlinson, Mack, Daniel Brunskill and Mike McGlinchey.

How do you feel about the 49ers signing Mack?