MLB.com's Jason Beck reports that Krol's problem is similar to what Joe Nathan went through earlier in the season. Krol has lost some velocity off his fastball, but he insists that is due to mere fatigue and not injury: "Nothing hurting, nothing sore," he stated when asked.
Beck says that Krol will take a week off from throwing and receive treatments on his arm. He will then resume throwing next week, and the Tigers expect him to make a brief Minor League rehab assignment before coming off the disabled list on July 6, his first day of eligibility.
The 23-year-old Krol has no record and a 4.32 ERA in 35 relief appearances for the Tigers in his first full season. He pitched in 32 games last year for the Washington Nationals beginning in June.
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