Roenis had left in the fourth inning of Tuesday's game in Anaheim after experiencing stiffness in his elbow in his last start.
He is 10-12 with a 3.85 ERA in 29 starts. His 163 2/3 innings this year are the third most for any rookie -- Kansas City's Yordano Ventura and Tampa Bay's Jake Odoorizzi have 165 each.
The 26-year-old was slated to start again on Sunday to finish the series in Houston against the Astros, but as Johns reports, manager Lloyd McClendon said he isn't sure who will be on the mound.
Seattle was third in the AL West heading into their game on the road against the Angels on Wednesday night.
- Marc Weinreich