"I couldn't do it," he said. "I still feel sorry."
Darvish was asked about being a free agent this offseason and didn't offer anything concrete, but he seemed open to returning to the Dodgers after coming over from the Texas Rangers on the July 31 non-waiver trade deadline.
Darvish had two of the worst performances of his Major League Baseball career in the World Series. He lasted 1.2 innings in both Games 3 and 7, allowing a combined nine runs (eight earned) on nine hits and two walks without recording a strikeout.
In 131 regular-season starts since his 2012 rookie season, Darvish's shortest start was three innings.
After the Dodgers dropped Game 7, Darvish posted a message on Twitter, thanking the fans, his teammates and the coaching staff for helping make his acclimation to a new city easier.
The Dodgers, who won an MLB-best 104 games during the 2017 regular season, will have to decide if they want to bring Darvish back to try to help end the franchise's 29-year championship drought.