He played college football for the Maryland Terrapins before being selected by the Chargers in the fourth round of the 1981 NFL draft.

[2] At the University of Maryland, College Park, Sievers established himself as a strong blocker, but he did not catch the ball much as the Terrapins did not pass often.

[6][7] Sievers was selected by the San Diego Chargers in the fourth round of the 1981 NFL draft with the 107th overall pick.

[6] They also drafted tight end Pete Holohan in the seventh round, who was Sievers's roommate at the East–West Shrine Game, where they became friends.

[8] In his first season in 1981, Sievers started 10 games while frequently replacing Kellen Winslow when the All-Pro tight end lined up outside as a wingback.

[9] In the postseason, the Chargers won their American Football Conference (AFC) divisional playoff game 41–38 in overtime over Miami.

[25][26] He played in only nine games and caught just two passes in 1986 while hampered by a compression fracture in his leg and underwent surgery in the offseason.