Silvestro, 23, was originally signed as an undrafted free agent in July but was released in September and signed to the practice squad later that month. He was promoted to the active roster on Dec. 23 and made two assisted tackles against the Dolphins the next day. He was released on Dec. 29 and signed back to the practice squad on Dec. 31.
Underwood, 24, played in five games for New England and caught three pases for 30 years. He was drafted by the Jacksonville Jaguars in the seventh round of the 2009 NFL Draft and caught eight passes for 111 yards for the Jaguars last year.
Update (7:55 p.m.): Underwood has responded to his release on Twitter, tweeting a series of messages:
[tweet https://twitter.com/TiUnderwood/status/165956520880779264 align='center']
[tweet https://twitter.com/TiUnderwood/status/165956952172666881 align='center']
[tweet https://twitter.com/TiUnderwood/status/165957643259748354 align='center']