Nick Johnson suffered a torn tendon sheath in his right wrist as he took a swing. ((J. Pat Carter/Associated Press))

Washington Nationals first baseman Nick Johnson was placed on the 15-day disabled list Thursday because of a torn tendon sheath in his right wrist.

Johnson, 29, suffered the injury on a swing late in Tuesday's 6-3 loss to the New York Mets.

He will be sidelined four to six weeks.

Johnson is hitting .220 with five home runs, 20 runs batted in, 15 runs scored and a whopping 33 walks in 38 games this season, his third with the Nationals.

He missed last season with a broken leg.

Johnson is a career .269 hitter with 81 HRs, 317 RBIs and 338 runs in 637 games since making his major-league debut with the New York Yankees on Aug. 21, 2001. 

He played for the now-defunct Montreal Expos in 2004.

Johnson's roster spot will be filled by first baseman Dmitri Young, who will be activated Friday.

Young, 34, sprained his lower back on April 3 and landed on the DL five days later.

Aaron Boone replaced Johnson in the lineup in Washington's 1-0 victory over the New York Mets on Thursday afternoon, spoiling Mike Pelfrey's no-hit bid with a leadoff single in the seventh inning.

With files from the Associated Press