ESPN host Mike Greenberg can’t believe what he’s seeing.

Sooner after the news broke that Jets quarterback Justin Fields was carted to the locker room after an apparent lower leg injury during training camp on Thursday, ESPN’s morning show “Get Up!” came back on the air.

Standing in a panel of four, Greenberg began in disbelief.

“I am speechless,” Greenberg said, via Awful Announcing . “I don’t know how to put into words how frustrated I am.”

Fields went to the ground on a non-contact injury during team drills and afterward limped off the field. He was being pressured but wasn’t hit when he went down and suffered what appeared to be a lower-leg injury.

Medical staff attended to Fields in a tent, and he then rode in the passenger seat of the cart to the door of One Jets Drive. He w

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