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On July 14, 2019, the Knicks picked up the option on Trier's contract.

On February 22, 2018, he was ruled ineligible by the NCAA after testing positive for a banned substance. According to Arizona, it was a remnant of the same substance he was banned for a year earlier.

Following Arizona's loss in the 2018 NCAA Men's Basketball Tournament, Trier announced his intention to forgo his last season of collegiate eligibility and declare for the 2018 NBA draft.

After going undrafted in the 2018 NBA draft, on July 3, 2018, Trier signed with the New York Knicks of the National Basketball Association (NBA), on a two-way contract with the Knicks' NBA G League affiliate, the Westchester Knicks. Under the terms of that deal, Trier would split time between New York and Westchester. In his NBA debut on October 17, 2018, Trier recorded 15 points on 5-of-9 shooting, four rebounds, and two blocks in a 126–107 win over the Atlanta Hawks. On November 23, Trier scored a career high 25 points in a 114–109 win over the New Orleans Pelicans. On November 27, he recorded his first career double-double with 24 points and 10 rebounds as the Knicks lost to the Detroit Pistons. On December 13, Trier signed a standard NBA contract with the Knicks, becoming the first two-way player to sign a guaranteed NBA contract within the first two months of the season. On January 23, 2019, Trier recorded his second career double-double, scoring a new career-high 31 points, shooting 12-for-18 from the field, and grabbing 10 rebounds in a 114–110 loss to the Houston Rockets.

On January 20, 2017, it was announced Trier would make his return for the UCLA game after 19 game absence.

As a sophomore in 2016–17, he earned second-team all-conference honors in the Pac-12 and was named the most outstanding player in the Pac-12 Tournament.

In an 85–72 –victory over Fresno State on December 10, 2015, Trier scored a season-high 27 points on 8-of-11 shooting. He averaged 14.8 points per game in his freshman season but missed seven games due to a hand injury. On April 4, 2016, he announced he would be returning for his sophomore season.

Trier attended Montrose Christian School in his junior year, transferring from the Oklahoma City Storm and Tulsa NOAH (Northeast Oklahoma Association of Homeschools). He averaged 25.5 points, 4.0 rebounds, 2.8 assists. and 2.1 steals per game to lead Montrose to a 20-5 record and a National Christian Schools Athletic Association Division I title. He was named the 2014 Gatorade State Player of the Year and was a first-team Washington Post All-Met, elevating his recruiting stock. As a senior, Trier transferred to Findlay Prep in Henderson, Nevada. He averaged 26.6 points and 5.4 rebounds per game at Findlay. He was named to the 2015 USA Today All-USA second team. Playing for the West team in the 2015 McDonald's All-American Boys Game, Trier led his team in scoring with 17 points. In the Jordan Brand Classic, Trier scored 28 points and was named co-MVP.

He played in the FIBA Americas U18 Championship in 2014, winning a gold medal for the United States. He scored 9 points in the championship game. In five games he averaged 12.6 points and 1.0 rebounds per game. Trier competed in the FIBA U19 World Championship in 2015, winning a gold medal for the United States. Trier posted averages of 8.7 points and 1.5 rebounds per game.

Trier was born in Seattle, Washington to Marcie Trier and an unnamed father whom he never met. When he was in sixth grade, he was diagnosed with dyslexia. He was kicked off a varsity team in eighth grade for being too good. In 2009, Trier was the subject of The New York Times Magazine profile of his ability at a young age and the frequent travelling for AAU events it entailed.

Allonzo Brian Trier (born January 17, 1996) is an American professional basketball player for the New York Knicks of the National Basketball Association (NBA). He played college basketball for the Arizona Wildcats. As a sophomore in 2016–17, he earned second-team all-conference honors in the Pac-12 and was named the most outstanding player in the Pac-12 Tournament.