Chicago Cubs' left-hander Tsuyoshi Wada, who is working his way back from shoulder injury, allowed two runs in a six-inning rehab start on Monday.

Wada, who has been on the disabled list since June due to left-shoulder inflammation, allowed a pair of unearned runs on four hits in an otherwise trouble-free outing for Triple-A Iowa. He struck out six in his 85-pitch outing and earned the win.

"I made some pitches I wasn't satisfied with, but since results are what matter, it was OK," said the 34-year-old Wada, whose ability to return might change should the Cubs acquire or deal away starting pitching in the coming days.

"I can't predict the future at all. Regardless of the situation, I just want to keep on doing what I can to keep getting results."

Wada has started seven games for the big league club with a 1-1 record and a 3.73 ERA.