The righthander received a two-year deal worth $18.75 million with a club option for the 2024 season as well.
Why Matt Barnes Left Before Red Sox-Marlins Spring Training Game
Red Sox first-round draft pick Marcelo Mayer wants to sign 'as soon as possible' - The Boston Globe
Matt Barnes enjoyed serving as Boston Red Sox's player representative during MLB negotiations: 'I got to see how strong the union really is'
Red Sox sign Adam Duvall; former All-Star closer Matt Barnes DFAd
Red Sox sign Adam Duvall; former All-Star closer Matt Barnes DFAd
Red Sox trading Matt Barnes to Marlins - CBS Boston
Red Sox' Rich Hill, Jason Varitek test positive for COVID-19; Matt
Spring Training 2022 Updates: Final spring statistics and records
Red Sox notes: Matt Barnes looks strong as closer competition begins
Where we're supposed to be': The Red Sox are a pleasant surprise in nearly every way - The Boston Globe
Report: Red Sox 'actively marketing' one of their players
Examining Boston Red Sox 2021 bullpen depth after additions of
Matt Barnes, eight others cleared to rejoin Red Sox after determining they weren't risks to others due to COVID - The Boston Globe
Boston Red Sox's Matt Barnes went from trade rumors to contract extension and All-Star Game appearance in 11-month span
Boston Red Sox's Matt Barnes went from trade rumors to contract extension and All-Star Game appearance in 11-month span