During his introductory press conference on Dec. 6, new Colorado head football coach Mel Tucker said his Buffaloes would be tough.

Recruiting power in the trenches will certainly help in that regard and last weekend, the Buffaloes added a lot of muscle.

Defensive tackle Austin Williams, defensive end Jeremiah Doss and offensive lineman Vaatofu Sauvao all gave their verbal commitments to CU — the first commitments for Tucker since taking the job. The Buffaloes also picked up tight end Jalen Harris, a graduate transfer from Auburn.

With the early signing period beginning Wednesday, the Buffs now have 15 players verbally committed, in addition to Harris.

Williams, a 6-foot-4, 288-pounder from Tifton, Geo., had committed to Colorado State on Dec. 6. He visited CU this past weekend, however, and flipped his commitment to CU.

The 6-foot-5, 250-pound Doss has played two seasons at Hinds (Miss.) Community College. He was a late visitor over the weekend and was impressed enough by CU to give his commitment. He had originally committed to Old Dominion last month.

Sauvao is another junior college transfer, having played at Modesto (Calif.) Junior College the past two years. A former teammate of CU defensive lineman Mustafa Johnson, Sauvao is 6-foot-2, 315 pounds.

Harris left Auburn’s program in September and reportedly chose CU over Georgia, Kansas, Troy and Vanderbilt. He has one year to play and is eligible immediately.

Primarily a blocking tight end, he caught four passes for 33 yards and two touchdowns in his career at Auburn. He played in the first three games of this past season with Auburn.

Contact staff writer Brian Howell at howellb@dailycamera.com or twitter.com/BrianHowell33.