Yankees LHP CC Sabathia will play one final season in the major leagues, he said in a video posted on his Twitter page.
The veteran left-hander signed a one-year, $8 million deal with the Yankees on Wednesday to return for a 19th season.
"This will be it," said the 38-year-old Sabathia, who won a World Series as a member of the Yankees' 2009 team.
Sabathia posted a 3.65 ERA in 29 starts for the Yankees in 2018. He allowed three runs on five hits in three innings during the Yankees' 4-3 loss to the Red Sox in Game 4 of the ALDS.
He underwent right knee surgery earlier this month.