NEW YORK — Noah Syndergaard arrived at Citi Field on Saturday and was summoned by Mets Manager Terry Collins.

“He just called me into his office and asked how I was feeling after my relief appearance,” the rookie pitcher explained Saturday. “My body and my arm have never felt better. So that’s what I told him, and I’m ready to go.”

A 23-year-old right-hander who made his big league debut in mid-May, Syndergaard will start for New York in Game 2 of the NL Championship Series against the Chicago Cubs and Jake Arrieta on Sunday night.

Syndergaard (9-7) allowed three runs, five hits and four walks in 6 1/3 innings in Game 2 of the Division Series at Los Angeles last weekend, losing on a night that turned when Chase Utley broke Ruben Tejada’s leg with a takeout slide at second.

Syndergaard then threw 17 pitches in the seventh inning Thursday against the Los Angeles Dodgers in the final game of the NL Division Series, the first relief appearance of his big league career. He warmed up four times before coming in, and Collins said Syndergaard threw 80 total pitches.

Jacob deGrom, who won twice in the Division Series, is set to start Game 3. Steven Matz, a 24-year-old rookie who made his debut in late June, is the Mets’ Game 4 starter and will be available out of the bullpen this weekend. If he does not make a relief appearance, Matz would be starting on seven days’ rest.

Arrieta (22-6) led the major leagues in wins, and his 1.77 ERA was second-best in the major leagues.