Pittsburgh Pirates closer Jason Grilli likely will need four to eight weeks of rest but not surgery for a strained flexor tendon in his forearm, the team announced Friday.
Grilli visited Dr. James Andrews to have the arm examined after he left a game on Monday and was placed on the disabled list.
According to reports, Grilli will be re-evaluated in 10-14 days.
"Until that time, Jason will remain rest, treatment and rehabilitation only, Pirates general manager Neal Hungtinton said. "Jason's estimated return date will be better clarified after his re-evaluation exam, but pitchers with this type of injury typically miss between four and eight weeks."
Mark Melancon has stepped into the Pirates' closer role while Griffi is sidelined.
Grilli has a National League-leading 30 saves with a 2.34 ERA and made the All-Star team for the first time in his career at age 36.