CHICAGO -- The Cubs were one of baseball's most aggressive teams when the signing period for non-drafted free agents opened on Sunday. Chicago has continued to look for prospects to add to its system from the unique pool of options in the wake of the 2020 MLB Draft.

On Monday, the Cubs reportedly reached an agreement with University of Minnesota right-hander Sam Thoresen, who posted on his Twitter page, "Proud to join the Cubs organization!" The Cubs have not confirmed any signings, which would require a physical prior to becoming official. Non-drafted free agents are eligible to sign with any Major League team for a maximum $20,000 bonus.

The Cubs reached agreements with at least eight non-drafted players on Sunday.

• Team-by-team: Undrafted free agent signing tracker

A 21-year-old junior, Thoresen posted a 5.74 ERA in three seasons with Minnesota, amassing 118 strikeouts against 85 walks in 91 innings. That equates to a rate of 11.7 strikeouts per nine innings for the righty in 34 outings (19 starts) in his collegiate career. Before the 2020 season was stymied due to the COVID-19 pandemic, Thoresen had 19 strikeouts and 18 walks in 9 1/3 innings across five appearances (two starts).