I don't think the NFL can legally force players to stand/show reverence during the national anthem...the players union would have a chiit fit.

If you don't want to show respect for the anthem(American or Canadian born), then get the fugg out and flip burgers somewhere.

PS: I can't believe we even have to discuss this issue, it's common sense and unpatriotic to do anything disrespectful towards our flag, country, or President (see Kathy Griffith).