"He's not healing quick enough, so we figured we better put him on the DL," said manager John Gibbons.
In response, the Blue Jays recalled outfielder Anthony Gose from Triple-A Buffalo prior to Thursday's game at Rogers Centre.
In 28 games with the Bisons this season, the 23-year-old is hitting .236 with two home runs and 10 RBIs.
He has appeared in three games for the Blue Jays in 2014, posting a .333 batting average (2-for-6) and three walks. He's played 111 games with Toronto over three seasons, batting .241 with 20 stolen bases.
"He's played pretty good in the big leagues," Gibbons said of the speedy Gose. "He's been up [three] games already this year, and he's contributed in [those] games. Maybe he's one of those guys who plays better up here anyway. He thinks he's a big league player and we're giving him the shot to keep doing it."
The timing of the Rasmus injury is unfortunate. After a slow start, he'd been enjoying success at the plate. He'd tweaked his mechanics with hitting coach Kevin Seitzer and the results were promising.
In the 10 games leading up to this week's series against the Angels, the 27-year-old had slugged five homers and posted a 1.186 OPS in 41 plate appearances after putting up a .192 average and only three home runs through 20 games to start the season.
Jamie Ross is an associate reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.