ANAHEIM -- Angels center fielder Mike Trout sat out of Monday's 9-6 win over the Astros at Angel Stadium, as an MRI exam revealed that the All-Star is dealing with a right calf strain. The injury is considered minor, and he is day to day.

Trout tweaked the calf while chasing down a ball in the outfield in the first inning of Sunday’s 6-3 win over the Mariners. The Angels recalled fellow outfielder Michael Hermosillo from Triple-A Salt Lake to fill in while Trout recovers. Rookie lefty Jose Suarez was optioned to Triple-A to make room for Hermosillo, who started in center field and hit ninth against Houston.

Neither Angels manager Brad Ausmus nor Trout ruled out Trout returning on Tuesday, but it seems more likely they'll play it safe.

"I knew when I came out of the game I had a little something there," Trout said Monday night. "Obviously, it showed. I took some swings today. Felt OK. It's just running I have to worry about. We'll see how I feel tomorrow and see where it goes. I want to be out there. It's up to the training staff."

Hermosillo gives the Angels three healthy outfielders, joining Justin Upton and Kole Calhoun. Outfielder Brian Goodwin, who has been out with a right wrist contusion since July 2, is expected to be reinstated from the injured list on Tuesday.

Hermosillo, 24, hit .250/.336/.444 with four homers, four stolen bases and 13 RBIs in 30 games with Salt Lake after missing the first two months of the season with a core muscle injury that required offseason surgery.

“It was super frustrating at first, just seeing everyone get going in spring and not having the ability to go out there and even compete for a job,” Hermosillo said. “But I took what I could from it."

Hermosillo, ranked as the club's No. 13 prospect by MLB Pipeline, said he worked to tweak his mechanics this year and that he started to feel more comfortable recently. Hermosillo had a .933 OPS in 10 games in July after posting a .703 OPS in 20 games in June.

"It was kind of weird at first, just because I didn't have any Spring Training so I felt a little rushed," Hermosillo said. "It felt like the pitches were just a little bit different compared to like going into a season after 100 at-bats in Spring Training. But I was starting to get my feet underneath me toward the end and I'm starting to feel really good."

With Suarez optioned to Triple-A, the Angels’ starting pitcher for Friday’s series opener in Seattle is to be determined. Right-hander Jaime Barria could be a candidate, but he struggled with Salt Lake on Saturday, allowing nine runs on 12 hits over 4 2/3 innings in Las Vegas.