A source told Ganguli the Texans released Brown ahead of Houston's third preseason game so he has a chance to catch on with another team. Brown signed a one-year deal with the Texans in May.
In three seasons in New York, Brown started 32 games, missing the 2013 season. In 2012, he had a career year, recording 76 tackles, two forced fumbles and eight interceptions.
Brown, 28, played the first two seasons of his career in Oakland and Indianapolis. He was a seventh-round pick of the Raiders in 2010.