Heuer is building up in extended spring training after falling behind due to arm soreness, Jim Callis of MLB Pipeline reports.
As a 21-year-old who pitched the last two years in the rotation at Texas Tech, Heuer would have been assigned to Single-A or High-A if he were healthy and fully built up, but his pro debut is now to be determined. The Yankees gave Heuer a $400,000 bonus after selecting him in the eighth round last year.