Janssen, 34, has posted a 31-29 record with 90 saves in 437 career appearances in the Major Leagues with the Nationals and Blue Jays. Washington signed Janssen as a free agent before the 2015 campaign, and he gave up five home runs in 40 innings this past season.
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McLouth, 34, batted .173 in 79 games for the Nationals in 2014, and he's been a .247 hitter with 101 home runs in 1,045 games at the big league level with the Nats, Pirates, Braves and Orioles. McLouth was an All-Star for Pittsburgh during the '08 season, and he hit .258 with 12 home runs for Baltimore in '13.
Spencer Fordin is a reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.