Scary news from the Denver Broncos ... head coach Vic Fangio says offensive lineman Graham Glasgow was forced to go to a New York hospital following their game Sunday after he experienced heart issues during the contest.

Fangio said Glasgow left MetLife Stadium in an ambulance after the team's 27-13 win over the Giants ... explaining the 29-year-old guard "had an irregular heartbeat going."

"We kept him up there in New York and they examined him totally," Fangio said. "He's still up there. He'll stay the night."

The good news ... Fangio said tests so far have come back "so good" -- and the expectation is Glasgow will return to Denver on Tuesday.