The neck stiffness that forced Yu Darvish to miss his last start has subsided and he said he’s good to go for Sunday’s start against the Nationals.

“There’s no problem at all,” said Darvish, who threw 20-25 pitches in a bullpen session Friday.

“I felt as good as the bullpen session I had in Detroit. No discomfort whatsoever.”

The Texas Rangers ace was a late-scratch from his previous scheduled start Tuesday in Minnesota with neck stiffness. An MRI showed no significant damage.

Darvish remained coy when asked what caused the setback, saying: “I can’t really say what the cause was.”

Either way, manager Ron Washington feels confident that Darvish can take them deep into the game. He downplayed the idea he’d need to keep a long reliever fresh for Darvish.

“I don’t need anyone to back up Darvish,” Washington said. “He won’t take it if he thinks it’s going to be an issue.”

Darvish dealt with neck stiffness in spring training and it forced him to begin the season on the disabled list. He was expected to be the Opening Day starter.