Before the first scrimmage play of the night, as Eagles fullback Ben VanSumeren stayed on the ground, Carter approached Prescott. After a brief exchange, the third-year DT spat on Prescott. An official was close to the action and saw the situation, threw a flag, ejected Carter and hit the Eagles with a 15-yard penalty.

The incident is the first major test of the NFL’s increased emphasis this season on sportsmanship.

Sirianni declined to specifically address details of any kind of conversation he had about the incident with Carter, who essentially sat out Thursday night’s opener against Dallas when he was ejected...