Croel was selected by the Broncos in the first round of the 1991 NFL Draft. In 1991, he was chosen as the NFL Defensive Rookie of the Year and the UPI AFL-AFC Rookie of the Year award. In that same rookie year, Croel recorded ten sacks, his single-season high. In 101 career games, Croel scored one touchdown, recorded 24.0 sacks, two interceptions and 38 yards. Today, Croel resides in Los Angeles.