Imanaga, 31, strained his left hamstring when he went to cover first base in the sixth inning of Sunday's 4-0 loss at Milwaukee.

Given the way Shota Imanaga walked off the field in Milwaukee on Sunday, Cubs manager Craig Counsell felt a trip to the injured list was the likely outcome for the left-handed starter. That step officially arrived for Imanaga prior to Monday’s game against the Giants.

Chicago's bullpen subsequently allowed a pair of inherited runners to score, impacting Imanaga's line for the worse. The book closed on his afternoon with him surrendering two runs on four hits and a walk. He also struck out four of the 22 batters he faced.