Signed by the Seattle Seahawks in 1996 after going undrafted in the 1996 NFL draft, Grant spent 4 years with the team before going to the New England Patriots. During his 2-year stint with the Patriots, he would win Super Bowl XXXVI in 2001 when the Patriots beat the Rams 20–17. In 2002, he joined the St. Louis Rams, where he spent the final 3 seasons of his career with before retiring.