Minnesota's Cole DeVries came out after three hitless innings due to a sore right forearm as the Twins beat the Boston Red Sox 8-3 Friday.
DeVries, scheduled to make his first start of the season on April 6 at Baltimore, allowed one earned run during 17 innings in spring training and held batters to a .071 average.
Pitching coach Rick Anderson said it appeared the soreness was a muscle issue. DeVries was to be reevaluated Saturday.
Red Sox starter Ryan Dempster gave up three hits and four walks in four innings with four strikeouts.
Twins first baseman Justin Morneau did not play because of tightness in his back and likely won't play Saturday, but Twins manager Ron Gardenhire said he will be ready for Monday's opener against Detroit and Justin Verlander.
''His concussions and all that he had experienced is not an issue at all,'' general manager Terry Ryan said. ''He does have a little bit of a stiff back, but I suspect you're going to see him in the opening-day lineup.''