The Boston Celtics rounded out their final four training camp spots on Sept. 26 by filling each spot with rookies to make the total of first-year players to 11.

New additions named L.J. Peak, Andrew White, Jonathan Holmes and Devin Williams will join the team during training camp in Newport, Rhode Island from Sept. 26 to Sept. 28.

Peak achieved a breakout campaign in his third and final year at Georgetown University, where he was able to maintain career highs in points (16.2), rebounds (3.8) and assists (3.5). The undrafted 21-year-old played through four games of the summer league as a member of the Houston Rockets and tallied 7.3 ppg on 10 of 20 shooting.

White has college experience from Kansas, Nebraska, and Syracuse in that order. The 6-foot-7 forward participated in five summer league contests with the Cleveland Cavaliers, and produced 7.0 points on 36.4 percent field goal shooting.

24-year-old Holmes has floated around his entire career, and has been unsuccessful thus far in finding a steady situation. Jonathan spent 10 games overseas with FC Barcelona Lassa, and last season he was with the Canton Charge in the G League for 30 affairs. The University of Texas at Austin product also has a history with the Celtics from the 2015 summer league, where he netted 10.0 points and 5.0 rebounds across eight appearances.

Williams is in a similar boat, with experience in both the G League as well as in the Australian NBL. While the 23-year-old wasn’t much of a factor in either of his teams with career-highs of 3.2 points and 4.0 rebounds both occurring in Melbourne, he also hasn’t been given much of an opportunity with that stat line happening over a mere 10.5 minutes of action.

These signings are another tribute to the road that Danny Ainge took throughout this off-season. Young talent and players with high ceilings plaster the Boston roster, which is complimented by some of the best play-makers both on and off the ball in Kyrie Irving and Gordon Hayward. Hopefully, all of these juvenile prospects won’t be too much for veteran Al Horford to handle, and their inexperience won’t cost many games.