NFL spokesman Brian McCarthy on Monday night said the league is "working closely" with stadium personnel "to ensure that we have an NFL-quality surface" for the game.
NFL Executive Vice President of International Mark Waller said the league has worked extensively with the stadium, Estadio Azteca, for months to prepare and didn't have any major concerns until recently.
Schefter reported the field at Azteca Stadium is "a mess" and might not be safe for the players, adding a number of players had been strongly considering not playing if the game weren't moved.
Both teams are 9-1, making it just the fifth game since the 1970 merger between teams with one or fewer losses in Week 11 or later.
Details on ticket reimbursement procedures will be announced in the days ahead. Each team comes in with a 9-1 record.
"It's not fair to risk our health", one prominent player told Schefter. Because the Chiefs-Rams game counts as a Los Angeles home contest in its schedule, it was moved there rather than Kansas City.
Two recent events apparently damaged the hybrid playing surface, a combination of grass and synthetic filler. A recent concert at Estadio Azteca reportedly left the field in poor condition, and recent efforts to fix or replace the playing surface apparently had not quelled fears over potential injury.
The Rams had planned to practice at altitude this week in Colorado Springs, Colo., before going to Mexico City.
Chiefs right tackle Mitchell Schwartz, who is seven snaps away from having played 7,000 consecutive snaps since the start of his professional career, gave the impression that all road games are the same from a player's perspective.
The field has reportedly taken serious damage from soccer games and concerts.