The Minnesota Twins have placed newly acquired reliever Sam Dyson on the 10-day injured list with right biceps tendinitis.
Dyson, who was traded to Minnesota by the San Francisco Giants on July 31, has struggled in two appearances with his new team, allowing six earned runs in two-thirds of an inning.
The Twins hope Dyson's time away is a matter of days, not weeks. Baseball operations president Derek Falvey said before Sunday's 3-0 win over the Royals that he was surprised by the injury.
"He didn't have any open injuries, and from our medical review and otherwise we felt good about where he was," Falvey said.
The right-handed Dyson, 31, is 4-1 with a 3.48 ERA and two saves in 51 appearances this season with the Twins and Giants.
Minnesota recalled left-hander Devin Smeltzer from Triple-A Rochester to replace Dyson on the 25-man roster. Smeltzer (1-1) pitched six scoreless innings in Sunday's win over the Royals, allowing two hits and striking out four batters.
The Associated Press contributed to this report.
