The Cubs transferred Merryweather (ribs/back) from the 15-day injured list to the 60-day IL on Wednesday, Taylor McGregor of Marquee Sports Network reports.

Merryweather (ribs/back) underwent additional testing Monday and it was determined that he is dealing with a rib stress fracture in his back, Maddie Lee of the Chicago Sun-Times reports.

Merryweather was placed on the 15-day injured list Sunday with a right shoulders strain, Tony Andracki of Marquee Sports Network reports.

Merryweather tossed 1.1 scoreless innings to earn a hold in Friday's 9-7 win over the Dodgers. He allowed a hit and a walk, while striking out three.

Cubs manager Craig Counsell doesn't plan to designate specific roles for Merryweather or any other reliever before the season, Sahadev Sharma of The Athletic reports.

Merryweather signed a $1.175 million contract with the Cubs on Thursday to avoid arbitration, Bruce Levine of 670TheScore.com reports.

Merryweather (4-0) tossed a scoreless inning of relief to earn the win Saturday against the Blue Jays. He walked one and struck out two.

Merryweather stands a decent chance of securing an Opening Day bullpen role with the Cubs, particularly because he's out of minor-league options, Jordan Bastian of MLB.com reports.