Andrew Luck is back on the football field — coaching, that is.

The former Colts quarterback, who stunningly retired from the NFL in 2019 at the age of 29, is involved in football once again, coaching for Palo Alto High School as he pursues a Master’s degree at Stanford’s School of Education, according to The Mercury News.

“The first week he got here, we have our whole playbook and he walks in not knowing any of our plays,” Palo Alto senior quarterback Declan Packer told The Mercury News. “The next day he comes, he knew every single play. It was crazy — he knows everything about football.”

Luck, 34, reportedly returned to Palo Alto last fall to begin studying at Stanford, his alma mater, when he first reached out to the coaching staff at the high school.

This season, the former Pro Bowler has been coaching at practices twice a week, helping everyone from the quarterbacks to the defensive backs on technique.

“It’s great to have someone of that caliber on your staff,” coach Dave DeGeronimo said, per the report. “The kids love it.”

Luck’s surprising retirement came during what many believed was just the middle of a special career.

He had just thrown for 4,593 yards and 39 touchdowns in 2018 en route to winning the NFL’s Comeback Player of the Year when he called it quits in 2019.

Luck was selected No. 1 overall by the Colts in the 2012 NFL Draft and emerged as the team’s franchise quarterback following the departure of Peyton Manning.

With Luck at the helm, Indianapolis reached the playoffs in four of his six seasons.

the team to the playoffs four times before he retired.

“If I were to coach, what would I bring? Well, certainly an experience that’s semi-unique on the scale of football experiences.“ Luck said to ESPN in a profile published last December. “I shouldn’t say semi-unique. Completely unique.”

Luck, a particularly quiet person, turned down an interview request for The Mercury News story.