The 25-year-old Rasmussen made his Major League debut earlier this season and allowed two hits and a walk without allowing an earned run over two innings. He displayed some nerves during that brief stint, but the Blue Jays hope the native of California will be able to settle in with a second go-around.
"He got a couple of pretty good lefties out," Blue Jays manager John Gibbons said. "But I think coming up once and then coming back the second time, it has to help you. Now the shock of it, all of that is out of the way. But I'll tell you, he seems like a pretty cool cat."
Toronto has made a series of roster moves this week, but Rasmussen has a shot to stick with the club for an extended period of time. Cecil is expected to miss the next two weeks, and there was a noticeable void in the bullpen with Aaron Loup as the only left-hander at Gibbons' disposal.
Rasmussen posted a 2.62 ERA with 23 strikeouts and 14 walks over 24 innings at Triple-A Buffalo. He has the ability to throw multiple innings, but when the bullpen is rested he'll likely be used as a situational lefty.
Gregor Chisholm is a reporter for MLB.com. Read his blog, North of the Border, and follow him on Twitter @gregorMLB. This story was not subject to the approval of Major League Baseball or its clubs.