Rasmussen will serve as the Rays' opening pitcher for Sunday's game against Arizona, Marc Topkin of the Tampa Bay Times reports.
Rasmussen will make his second start of the season Sunday, though he's expected to pitch just one or two innings before handing the ball off to bulk reliever Tyler Alexander. Since completing his recovery from an internal brace procedure and returning from the 60-day injured list Aug. 7, Rasmussen has given up three earned runs on six hits and no walks while striking out six over five innings.