Deatrich Wise Jr. and Adam Butler have led Patriots' rookie class

Patriots fourth-rounder Deatrich Wise Jr. is playing more than half the team's snaps on defense. Jim Rogash/Getty Images

FOXBOROUGH, Mass. -- The New England Patriots made only four draft picks in 2017, with only three of them making the team. Four undrafted players round out the team's rookie class. Here is a midseason review of their contributions:

Derek Rivers, LB, third round: He tore his ACL in a joint practice with the Texans in mid-August. Grade: Incomplete

Tony Garcia, OT, third round: He got off to a slow start in training camp, fell behind, and later was put on the non-football illness list. Grade: Incomplete

Deatrich Wise Jr., DE, fourth round: He has been the team's top rookie, playing a surprising 51.4 percent of the defensive snaps and providing a pretty consistent pass rush. Grade: Above average

Jacob Hollister, TE, undrafted: One of the surprise stories of training camp, the Wyoming alum made the roster and has served as the No. 3 tight end. He has played 6.7 percent of the offensive snaps, contributed on special teams coverage units and has three catches for 37 yards. Grade: Above average

Harvey Langi, LB/DE, undrafted: The most highly touted of the team's undrafted class, he played in one game (Week 2 vs. Saints), with his primary contributions coming on special teams. He later landed on the non-football injury list after being involved in a car accident. Grade: Incomplete

Adam Butler, DT, undrafted: The Vanderbilt alum came out of nowhere and has become an invaluable part of the defensive-line rotation, with a maturity beyond his years. The 6-foot-5, 300-pound Butler has played 39.5 percent of the defensive snaps and has 12 tackles and one sack. Grade: Above average

Cole Croston, OL, undrafted: He has been inactive for all eight games, with offensive line coach Dante Scarnecchia saying, "We really like Cole. We think he has upside going forward. He's our eighth lineman; he's a young kid just learning. It's a big jump from the University of Iowa; he's learning and getting better every day." Grade: Incomplete