The Giants suffered a shocking injury Thursday in their first training camp practice, as wide receiver Corey Coleman suffered a torn anterior cruciate ligament, a knee injury that will end his 2019 season before it began.

The injury was revealed Friday morning. A day earlier, another receiver, starter Sterling Shepard, left practice early after fracturing his left thumb. Shepard will be out of action at least two weeks before he will be further evaluated.

Coleman, 25, was a 2016 first-round draft pick of the Browns and was a big disappointment in Cleveland. The Giants signed him last season and in eight games he had five receptions for 71 yards. He provided a spark as a kick returner and he figured in the plans on offense this coming season.

“He was a guy that had a chance to be in there and compete to either start or have a role,’’ coach Pat Shurmur said.

Without him, the Giants will look to Cody Latimer, Russell Shepard and Bennie Fowler, as well as rookie Darius Slayton. They will hold a workout on Saturday and most likely will sign a receiver, as the numbers at that position are dangerously low for training camp.

Golden Tate, the veteran signed the day after Odell Beckham Jr. was traded to the Browns, said the mood in the receivers room was “definitely a bit deflated’’ after hearing about Coleman’s injury.

Apparently, Coleman hurt his knee early in practice, but he remained on the field for the duration of the session.

“This will show the testament of a freak athlete and freak body composition this guy has,’’ Tate said. “He did it, I think, earlier in practice at some point. I don’t know if anyone really knew. I remember him mentioning, ‘Hey, my knee kind of hurts.’ The guy went through practice and ran some great routes. He ran a post corner that was unreal. We watched the film and I was like, ‘He had a torn ACL?’ You would have never known.”