Mariners top prospect Jarred Kelenic is expected to make his MLB debut on Thursday, according to ESPN's Jeff Passan.
Kelenic, 21, will likely join Seattle's lineup as it hosts Cleveland at T-Mobile Park.
Kelenic is currently the No. 4 prospect in baseball, per the MLB.com prospect rankings. Fellow Seattle outfield prospect Julio Rodriguez is baseball's No. 5 prospect, according to MLB.com.
The timing of Kelenic's promotion to the majors came under controversy in February. Kelenic claimed the Mariners were manipulating his service time after a video was released featuring comments from former Mariners president and CEO Kevin Mather.