New England Patriots coach Bill Belichick, citing an error made by league officials, confirmed that the footballs used for kicking in the first half of Sunday's Week 15 game against the Kansas City Chiefs were underinflated by about 2 to 2 1/2 pounds.
"I think you could see that by the kicks," Belichick said Friday during a news conference. "Both kickers missed kicks. (Chiefs kicker Harrison) Butker hadn't missed a kick all year. Kickoffs, we had two of them that almost went out of bounds.
"They had six balls. It was both sets of balls.