The young right-hander has pitched 130 innings over 21 starts and is on pace for 195 innings, well beyond the career-high 139 1/3 he threw last year in the Minor Leagues. So the club will be cautious with him in the final two months, holding him out now until next Tuesday in Texas.
Pineda allowed just one hit in 6 1/3 innings in his last start Saturday against the Rays.
"We'll pick spots [to rest him]," manager Eric Wedge said Tuesday. "A day here, two days there, that type of deal where we can spread it out a little more. This will be one of his more lengthy breaks."
Wedge declined to reveal an innings limit for the season, however.
"We have something in mind, nothing we want to go public with," said Wedge. "But we have an idea of where we'd like him to end up, and I'm confident that's where he'll end up with the plan we have in place.
"As important as anything is for him to pitch through September. What we don't want to do is have to shut him down early. We want him to pitch through September so he has that repetition and experience and can work himself into a normal big league offseason routine."
The Mariners have four straight Thursdays off in August, so they will be able to give all their pitchers an extra day where needed. But they're using the first Thursday off-day to keep the other starters on a five-day schedule and push Pineda to the back of the rotation to give him the extra time.
The planned rotation now calls for Jason Vargas, Blake Beavan and Felix Hernandez to throw in Anaheim this Friday-Sunday, with Charlie Furbush, Pineda and Vargas then throwing in Texas on the following series.