The Cardinals placed Lynn on the 15-day injured list Wednesday with right knee inflammation.
Lynn has apparently been dealing with the knee issue for a couple starts and was seen limping around the clubhouse after Tuesday's 8-1 win over the Rangers. He'll be eligible to return from the IL in mid-August and has a shot to be ready around that time, as the team believes a little rest will help. The newly acquired Erick Fedde will slide into Lynn's rotation spot, and Andre Pallante will also remain in the rotation for the time being.