Justin Tucker’s 66-yard game-winning kick Sunday wasn’t just painful for Lions fans … it also REALLY hurt a Ravens assistant coach, who blew out his hamstring celebrating!!!

Baltimore headman, John Harbaugh, explained the situation to reporters Monday … saying linebackers coach, Drew Wilkins, popped his hammy while jumping for joy after Tucker’s epic boot.

Harbaugh took a little bit of joy in announcing the injury … joking with media members that the wound was all due to Wilkins’ poor gym habits.

“Drew is philosophically opposed to exercise,” Harbaugh said with a big smile. “He’s made that clear over the years, kind of emphatically. He’s a staunch believer in not exercising. You can see where that gets you.”

Video of the celebration is pretty funny — even though it’s got to be pretty painful as well — ’cause you can see in the clip Wilkins tumbled hard after rushing the field to celebrate Tucker’s kick.

Unclear how long Wilkins’ recovery process will be — Harbaugh joked the MRI results are not in yet — but we’re pretty sure a come from behind, improbable 19-17 win will make the pain a little easier to swallow.

Ice up!!!