The NFL is investigating an incident in which Dominic Raiola stepped on the ankle of Ego Ferguson.

"The matter will be reviewed and appropriate discipline will be applied for any potential safety-related rules violations," NFL spokesman Michael Signora said in an email Monday.

Raiola was caught on tape stepping on Ferguson's foot during the third quarter of the Detroit Lions' 20-14 win over the Chicago Bears.

Raiola said after the game that it was unintentional.