Rasmussen will serve as the Rays' opening pitcher for Saturday's game versus the Guardians, Marc Topkin of the Tampa Bay Times reports.
Rasmussen has put up a 2.79 ERA and 1.09 WHIP across 19.1 innings this season. He'll likely be asked to work the first one or two innings of Saturday's contest before turning the game over to Tyler Alexander, who is expected to work in bulk relief.