Arizona Wildcats guard Allonzo Trier declared for the 2018 NBA draft on Thursday night following Arizona's shocking 89-68 loss to the Buffalo Bulls in the first round of the NCAA tournament.

According to ESPN.com's Edward Aschoff, Trier said the following regarding his decision to enter the draft: "I'm not worried about [jumping to the NBA] right now, but I'm closing the book on this chapter and looking forward to the next one in my life. It's a pleasure to be coached by [Sean Miller] and be a part of him and this program for three years."

Freshman center Deandre Ayton also announced after the game that he will leave Arizona to enter the 2018 NBA draft.

As a junior in 2017-18, Trier registered career highs with 18.1 points and 3.2 assists per game. He also pulled down 3.0 rebounds per contest, and shot 49.9 percent from the field and 38.0 percent from three-point range.

Trier was suspended for 19 games in the 2016-17 season after testing positive for a performance-enhancing substance, and he missed two games in 2017-18 after a January drug screening "revealed the reappearance of a trace amount of a banned substance."

Per Aschoff, Trier said he never knowingly took the substance.

Trier struggled during Thursday's loss to Buffalo. He made just four of his 15 attempts from the field and finished the game with 10 points, two assists and one rebound.

Aran Smith of NBADraft.net ranks Trier as the No. 58 overall player in the 2018 draft class. In NBADraft.net's latest mock draft, Trier went No. 55 overall in the second round to the Indiana Pacers.

With Trier and Ayton out of the picture, Arizona will be without its top five scorers next season, and it has no recruiting commitments due to controversy surrounding its involvement in an FBI probe into corruption in college basketball.