"Twins first baseman Justin Morneau thought the cortisone shot he received Sunday night in his left wrist was working, but he changed his mind once he started swinging a bat Tuesday afternoon at Target Field.

With the pain in his wrist increasing with every swing he took, Morneau went to see hand specialist Thomas Varecka and, eventually, the team opted to immobilize the first baseman's wrist for 10 days and place him on the disabled list.

Twins general manager Bill Smith, speaking with reporters after Tuesday's game against Chicago was rained out, said the team will make a corresponding roster move today. That move might be activating infielder Tsuyoshi Nishioka, who played for Class AAA Rochester on Tuesday and was scheduled to fly to the Twin Cities today along with left-handed reliever Glen Perkins.

"We've waited about as long as we can," Smith said of Morneau's wrist. "We're looking at this as a short-term event."

Morneau's trip to the DL is a blow for a team on the verge of getting integral everyday players back from the DL. The Twins have used the DL 15 times for 13 players this season (Jim Thome and Kevin Slowey have each been on twice), they have two players on the 60-day DL (Joe Mauer and Nishioka), one on the seven-day DL (Denard Span) and nine currently on the DL. "