Ryan Rolison RP

Rolison didn't travel with the Rockies for the season-ending road trip this week, Nick Groke of The Athletic reports.

The team previously indicated the left-hander would travel with the club for the final trip of the season, but he'll instead face live competition in Arizona in preparation of the instructional league that begins in October. Rolison appeared to have a chance of making his major-league debut, but he'll have to wait until at least 2021.

Rolison will be included on the Rockies' taxi squad for their season-ending road trip this week, Nick Groke of The Athletic reports.

One of the organization's top pitching prospects, Rolison looks like he could be under consideration to make his MLB debut during the final week of the regular season. As Groke notes, Rolison threw a side session at Coors Field on Sunday, which would put him on normal rest for a spot start Friday, when the Rockies kick off their series in Arizona with a doubleheader. The Rockies have no other obvious candidate to serve as the sixth man in their rotation this week, so Rolison could get the chance to showcase his skills with the hope of breaking camp with the big club in 2021. The 23-year-old split time between the California and South Atlantic Leagues in 2019, posting a 4.40 ERA, 1.35 WHIP and 132 strikeouts in 131 innings.

Rolison will be a part of the Rockies' 60-man summer camp.

The 22-year-old southpaw is one of the Rockies' top pitching prospects, but he was undone by having to pitch half his games in the hitter-friendly park at High-A Lancaster last year. While he is on track to eventually be a key piece of the Rockies' rotation, he is unlikely to see much time in the majors in 2020.

Rolison was invited to the Rockies' major-league spring training Wednesday.

Rolison spent a majority of the 2019 season pitching for High-A Lancaster, recording a 4.87 ERA, 1.44 WHIP, and 118:38 K:BB in 116.1 innings. Drafted by Colorado 22nd overall in 2018, the highly-rated pitching prospect has earned praise for his excellent command while pitching in an extremely hitter-friendly ballpark for Lancaster. Rolison will have the opportunity to learn from the big-league coaching staff this spring before likely returning to the minors for more seasoning.

Rolison threw six scoreless innings in his debut for High-A Lancaster, allowing two hits and zero walks while striking out seven.

Rolison allowed just one earned run while striking out 14 through three starts (14.2 innings) with Low-A Asheville to start the season, leading to a quick promotion to the California League. He doesn't have electric stuff, but he has an advanced repertoire and excellent command. His numbers will likely suffer from pitching half his games in the extremely hitter-friendly ballpark in Lancaster.