AP
Arizona guard Allonzo Trier (35) in the second half during an NCAA college basketball game against Arizona State, Thursrday, Feb. 15, 2018, in Tempe, Ariz. Arizona defeated Arizona State 77-70. (AP Photo/Rick Scuteri)

The NCAA has declared No. 14 Arizona's Allonzo Trier ineligible for the reappearance of the banned substance that led to a 19-game suspension last season.

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The school said the NCAA notified the Wildcats on Thursday that the junior guard had a trace amount of the substance from a drug test late last month. Arizona did not specify the drug, saying only it was a banned substance.

Arizona says the amount detected was minuscule by scientific standards and appeared to be a remnant of the performance-enhancing drug Trier unknowingly ingested last season. The NCAA agreed, the school said.

Arizona is appealing the decision and hoping Trier will regain his eligibility soon.

Trier sat out the first 19 games in 2016-17 after testing positive for the drug, which he said came from a well-intentioned person not affiliated with the university following an injury.