SEATTLE -- Just when it seemed like Justin Morneau was ready to bounce back from a sore left wrist, a few practice swings before Saturday's game at Seattle confirmed otherwise.

Outside the visiting clubhouse at Safeco Field, a frustrated Morneau said he took around 17 swings and felt the same pain in his wrist as he did five days ago. The team announced it will place him on the 15-day disabled list on Monday.

"It's better to get it right now rather than have it drag on through the summer and not be as effective or productive as I can be," said Morneau, the 2006 American League MVP. "Get it right now and be able to play the rest of the year healthy instead of battling through something and not being effective at all."

The move is retroactive to May 1, and Morneau will see team doctors when the Twins return to Minnesota to start a nine-game homestand.

To replace Morneau on the 25-man roster, the Twins will select the contract of infielder Brian Dozier from Triple-A Rochester on Monday. Dozier hit .276 (29-for-105) with seven doubles and 12 RBIs in 28 games with Rochester.

"I'm sure the plan is to play Dozier at shortstop and give Jamey [Carroll] a little spell and play Jamey around a little bit," acting manager Scott Ullger said after the game Saturday night. "We'll mix and match and work everybody in there. Dozier showed he can play in Spring Training and he's doing fine in Triple-A. I'm glad and happy for him and I think he'll be a good contributor to our team."

Morneau left Monday's game against the Angels after feeling pain in the same wrist he had surgery on last October. He had an MRI Tuesday in the Twin Cities and it showed only inflammation and fluid around his wrist -- no structural damage.

But he didn't play Wednesday or in Friday's 3-2 win over Seattle, and it looks like it might be some time before he can get back out there and be effective.

It's even more unfortunate for Morneau because he was looking forward to playing in front of family and friends. The British Columbia native bought around 80 tickets this weekend for his supporters, but they won't get to see their star play in Seattle for the second straight year.

"It's definitely disappointing," he said. "I missed the trip here last year and have a lot of people coming down, including my parents. Not being able to see me play makes it even more difficult."

Morneau, 30, is hitting .230 with four home runs and nine RBIs in 20 games this season.

Komatsu inserted into lineup vs. Felix

SEATTLE -- That didn't take long.

Just one day after the Twins claimed outfielder Erik Komatsu from the Cardinals, acting manager Scott Ullger penciled his newest player in the starting lineup Saturday against ace Felix Hernandez and the Seattle Mariners.

"He's a Major League player and I asked him if he was ready to play," Ullger said. "He said he was."

Komatsu, who arrived late Friday night, seemed comfortable when he answered questions from reporters inside the visiting clubhouse at Safeco Field.

"I don't have any outstanding tools -- I'm just a gamer," said Komatsu, who batted eighth and started in right field. "I play as hard as I can and hopefully help the team win."

The struggling Twins certainly hope that Komatsu, 24, can make an impact in the outfield. Clete Thomas, who was claimed off waivers April 14, didn't find much success as an extra outfielder and was designated for assignment Friday to make room for Komatsu.

The California native hit .211 (4-for-19) with two walks and three runs in 15 games with the Cardinals this season. He was drafted in 2008 by the Brewers in the eighth round and already has been with four different Major League teams in his short professional career, but he's taking it in stride.

"That is kind of crazy -- four years, four teams," he said. "Hopefully I can stick with one team."

Off the field, Komatsu is a musician. He goes by "Komo Beatz," on the Internet and had several tracks for sale available on his website: http://soundclick.com/komobeatz

"I just have always had a passion for music," he said.

Komatsu said he's teaching himself piano. His Twitter page (@KomoBeatz) has over 5,000 followers.

Worth noting

• The Twins will recall left-hander Scott Diamond from Triple-A Rochester on Monday. In six Triple-A starts this season, Diamond is 4-1, with a 2.60 ERA, seven walks and 26 strikeouts. The Twins will make a corresponding roster move prior to Monday night's game vs. the Angels at Target Field.

• Assistant general manager Rob Antony said that Alex Wimmers, Minnesota's 2010 first-round Draft pick, has a "very slight tear" in his ulnar collateral ligament.

"He's kind of in a holding pattern," Antony said. "Not doing too much right now."

• Acting manager Scott Ullger said that designated hitter Joe Mauer will "hopefully be behind the plate tomorrow."

"Joe went out in the bullpen today and caught, just to see where he's at and he said he's fine," Ullger said. "We'll see how he feels when he comes in tomorrow morning. But he went in the bullpen and caught and said he's OK."

Regardless, the team seems intent on keeping him in the lineup, whether it's behind the plate or at designated hitter.

"If he has to DH, he has to DH. That's fine," said Ullger, who is filling in for Ron Gardenhire over the weekend. "But we need his bat in the lineup for sure."

  Mauer is hitting .303 with four doubles and 14 RBIs this season. He's an impressive .376 (67-for-128) in 49 career games against Seattle.

• Chris Parmelee's run in the seventh inning of Friday's 3-2 win ended a 25-inning scoreless streak. It was the longest scoring drought by a Minnesota team since they went 26 consecutive innings without scoring from July 31-Aug. 3, 1994.