The Colorado Rockies received the unfortunate news earlier in the week that pitcher, and presumed ace of the starting staff, Jon Gary would be sidelined for roughly 4-6 weeks with a broken foot.

The injury stemmed from a minor injury to Gray’s big toe back in Spring Training. The flamethrowers is expected to miss roughly a month, Nick Groke of The Denver Post reports.

Colorado lost starter Chad Bettis during Spring Training to testicular cancer, making the loss of Gray much more critical. With an average age of 24.8, the Rockies young pitching staff have yet another hole to plug. Gray has been placed on the 10-day Disabled List, meaning the Rockies will need to find somebody to fill the void in the starting rotation for the coming weeks.

Presumed candidates include minor-leaguers Jeff Hoffman, German Marquez, and Harrison Musgrave. Also, long-reliever Chris Rusin is another arm to keep an eye on for a potential replacement. Rusin started seven games for Colorado last year and was the team’s go-to spot starter.

So, with solid prospects at the helm, the Rockies need to choose an arm to lock down the rotation until Gray returns to the mound.