If Detroit Lions coach Jim Schwartz is not camped outside of Reggie Bush's' door tomorrow afternoon, St. Louis Rams defensive end Williams Hayes could receive a knock on his door around 4 p.m.

Detroit is currently one of several NFL teams actively pursuing Hayes in free agency, according to sources. Hayes could potentially replace Lions defensive end Cliff Avril, who might sign with another team when free agency officially begins tomorrow at 4 p.m.

The pursuit of Hayes makes sense for a few reasons.

Hayes was originally a fourth-round draft pick by the Tennessee Titans in 2008, Schwartz's final season as a defensive coordinator. He appeared in eight games as a rookie under Schwartz, but had 11 starts in 2009 under Jeff Fisher. He followed Fisher to St. Louis last season and signed a one-year deal. Even though Hayes was extremely talented, he played behind Chris Long and Robert Quinn.

Despite coming off the bench, Hayes recorded seven sacks, 34 tackles, 11 quarterback pressures and five quarterback hits. He has 106 tackles and 15 sacks in his career. He could instantly compete for a starting spot in Detroit if Avril signs elsewhere.

In addition, the 27-year old reportedly earned only $1 million last season. It is unclear what Hayes is seeking during free agency, but Detroit might be able to put together a creative contract to keep the Lions under this year's salary cap.

Hayes also possess the leadership qualities Detroit is seeking to add this offseason.

Last season, Hayes was awarded the St. Louis Rams' Community Player of the Week for his efforts during the holidays.