TE Anthony Hill Signed

[superbowlbound]

is there any protection at all for taxi squad guys, as far as losing them to other teams goes? I realize he was a 5th round pick, and was therefore passed over a minimum of 4 times by every team, but the kid has talent. I'd hate to lose him because we couldn't figure a roster spot for him. I know they can only be signed away if they're put on the active roster, but is there anything as far as first refusal or anything like that we can do?