Dallas Cowboys' cornerback Terence Newman has been put on notice by the NFL after indicating his desire for revenge on Detroit quarterback Jon Kitna. Posted on Newman's locker Thursday was a letter he received from the NFL after making comments about Kitna during a satellite radio interview. Newman refused comment to reporters when he walked through the locker room. "Be advised that your comments will now compel us to carefully monitor your activities in this weekend's Cowboys-Lions' game," read part of the letter signed by Ray Anderson, NFL Executive Vice President for football operations. "As you know, flagrant fouls may subject a player not only to fines but to suspension as well. So conduct yourself accordingly." Kitna threw four touchdown passes in the regular-season finale in Dallas last year to end a 3-13 season for Detroit. In an interview the following week with a radio station in Seattle, where the Cowboys had to go for the playoffs, Kitna called out the Dallas defense, specifically linebacker Bradie James.