Yes, he said it's been a couple months:
"Lara is likely to get the bulk of playing time in place of Frelick, who said he’d been dealing with shoulder pain for the last two months.
He hoped the All-Star break would help calm things down, but he felt discomfort on a throw from right field in the top of the fourth and didn’t come out to the on-deck circle when his turn came up in the bottom of that inning.
“I felt like I couldn’t throw,” Frelick said. “Like a liability out there. That’s why I spoke up. I tried throwing as hard as I could to second and it kind of just dribbled out of my hand. I felt I needed to speak up and not push through it anymore.”
"I don’t want to sit here and say I can play through anything or I’m tough or whatnot, but what I hated specifically about [Friday] night and what made me finally speak up is feeling like I would maybe affect the team. That’s the last thing I want. I think you should play through anything you can bear, but [when it] costs the team is when you need to speak up.”
https://www.mlb.com/brewers/news/sal-frelick-has-right-shoulder-injury-for-brewers