Knack (chest) began a rehab assignment with Triple-A Oklahoma City on Thursday, yielding two runs on five hits and one walk over 1.1 innings.
Knack struck out a pair in the outing and got his pitch count up to 33. The right-hander has been out all season with an intercostal strain, and he will be built up as a starting pitcher before likely remaining in the OKC rotation once he's activated from the 60-day injured list.