Simmons, 29, is hitting .298 with three homers, 21 RBI, 22 runs and five steals.
The veteran shortstop was injured in the Angels' 3-1 loss to the Minnesota Twins on Monday. Simmons was hustling down the line on a grounder to first base in the eighth inning and landed awkwardly after stretching to try to beat the throw to first. He began rolling in pain beyond the bag.
"You guys saw the replay. It's tough," superstar Mike Trout said after the game, per Rhett Bollinger of MLB.com. "The way he plays, he plays hard, 100 percent. You can't tell him not to. He's always been doing that, lunging at the bag, trying to get a hit. It was a big situation in the game. If he gets on base there, a two-run homer ties it. So it's tough, especially if you lose a guy like Simba."
It was a tough inning for the Angels. Reliever Ty Buttrey game up a go-ahead homer in the top of the frame, and in the bottom half—just one at-bat prior to Simmons' injury—Shohei Ohtani was hit on the ring finger by a pitch as he struck out, though he was in the lineup for Tuesday's game.
"That was a pretty creepy inning," Buttrey said. "That escalated very quickly. Ohtani getting hit and Simba going down and me giving up the [homer], you couldn't have drawn it up any worse than that. But that's how this game goes. You hate to see it. ... Those guys are huge parts of our lineup and great teammates. I hope they recover just fine."
David Fletcher and Zack Cozart are expected to fill in for Simmons at shortstop.