The Seahawks and center Justin Britt have agreed to a three-year extension worth more than $9MM per year, a source tells Ian Rapoport of NFL.com (on Twitter). Britt, a second-round pick in the 2014 draft, was slated for free agency after the 2017 season. The team has confirmed the deal via press release. 
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The new deal marks a significant pay bump for Britt, who will carry a cap number under $1.1MM this year. Britt’s extension won’t kick in until 2018, but the yearly average would tie him for third in the NFL with Alex Mack of the Falcons if it were starting immediately. Only Cowboys center Travis Frederick ($9.4MM) and Brandon Linder ($10.3MM) have higher AAVs. He’ll now be among the league’s highest-paid players at the position with the ability to cash in again at the age of 29.
Britt has been a starter for the Seahawks in each of his three seasons, but he has been moved around the offensive line quite a bit. He played mostly right tackle in 2014 and shifted to left guard in 2015 before settling in at center last year.
The 6’6″ lineman graded out as Pro Football Focus’ No. 11 center in the NFL last season, putting him ahead of notable names like Maurkice Pouncey, Max Unger, and Jason Kelce.
Doesn’t Mack play for the falcons
Seems like an overpay for a guy that was rated middle of the pack by PFF. With that said, I know the market is high on lineman and they may rate him much higher than PFF.