Manager Ron Gardenhire dismissed any speculation that there was anything else ailing the first baseman. Gardenhire did not offer a timetable for Morneau's return. Michael Cuddyer started at first base, collecting two hits in the club's 5-3 win over the Orioles.
Elsewhere on the Twins' injury report, right-hander Kevin Slowey, who is on the 15-day disabled list with right shoulder bursitis, threw a bullpen session over the weekend and "everything looked good," Gardenhire said. Slowey will likely throw another session when the Twins return home Friday against Cleveland.
"We'll decide where we go from there," Gardenhire said.
Second baseman Tsuyoshi Nishioka, who broke his left fibula against the Yankees on April 7, had his leg X-rayed again and learned that it is healing properly. He has been walking in the club's exercise pool, riding a bicycle and will begin light running shortly, Gardenhire said. However, nothing has changed as far as his expected return in four to six weeks.
"Once he gets back, he'll get some at-bats in a rehab assignment, maybe down in Florida," Gardenhire said. "But that's all down the road."
It is still uncertain when catcher Joe Mauer will return from a viral infection.