Yankees ace Gerrit Cole will be out at least one-to-two months and will head to Los Angeles for an appointment with noted sports surgeon Dr. Neal ElAttrache, The Post has learned.

Several Yankees doctors and ElAttrache have viewed Cole’s preliminary film, and while none has detected a tear in his ulnar collateral ligament, there’s enough concern about the ligament that ElAttrache has suggested an in-person visit.

Word is that the defending AL Cy Young Award winner will be out for an “extended period,” although for now, the hope and belief is that Cole has a chance to return sometime in May or early June.

The Yankees will be without Gerrit Cole to at least the start of the season.AP

The initial readings of Cole earlier in the week were optimistic, with the belief the issue could be resolved with rest and other conservative treatments, but ElAttrache has recommended more testing, raising the level of worry.

Yankees manager Aaron Boone publicly ruled out Opening Day, but it’s clear Cole will need more time than that now.

At the very least, Cole will need to wait for swelling and inflammation to subside, and once that does, he will need to re-ramp back up to get into major league pitching shape.

The 33-year-old has shown his usual excellent velocity and command this spring, but his recovery, normally no problem for one of baseball’s most dependable starters, has been an issue.

When he felt a twinge in his elbow after one start the Yankees recommended an MRI exam.

But that turned out to be just the start of testing that has been going on for a few days and will continue out in Los Angeles with ElAttrache.

Gerrit Cole talks to the press at the start of Yankees spring training.USA TODAY Sports via Reuters Con

Former Yankees great Masahiro Tanaka was able to pitch successfully with a weakened elbow ligament, but many pitchers are not.

Since signing with the Yankees ahead of the 2020 season, no one has pitched more innings in baseball than Cole (664), who has performed like the workhorse the Yankees believed he would be when they signed him to a $324 million contract.