He said Guerra has been throwing at 90 feet and that he's building up strength. The reliever will appear in a few rehab games as soon as he is ready to go before returning to the ballclub.
Another reliever is on the mend as well. Blake Hawksworth, who has resumed throwing, threw a simulated game last week and he should be ready for a rehab stint at Class A Rancho Cucamonga in about a week.
Guerra has been on the disabled list since June 3 with right knee inflammation, while Hawksworth has been out all year after right elbow surgery in January to clean out scar tissue.