The Boston Red Sox have signed Rick Porcello to a four-year contract extension that runs through the 2019 season.

The deal is worth $82.5 million, according to a Major League source.

It breaks down to a $500,000 signing bonus, $20 million in 2016 and 2017 and $21 million in 2018 and 2019. His 2015 contract remains at $12.5 million.

The average annual value of the contract is $20.625 million.