Boxberger "threw well today," Rays manager Kevin Cash said. "Velo was good again, so that's exciting to see."
Boxberger, who's been out since May 31, said he thought he would be ready to return to the team for the next series against the Dodgers in Los Angeles.
"Look, I'm glad he feels that way," Cash said. "We've got to do what's right for us and obviously Box, I know Box is itching to get back. But at the same time, this has been quite the process. Quite the season for him.
"We want to make sure that he's totally healthy. We're going to discuss it internally. I'll probably give him a call tomorrow to see where he's at. Get his input also."
• Alex Cobb, working his way back from Tommy John surgery, threw a two-inning simulated game at Charlotte Sports Park on Saturday.
"He did good, 20 [pitches] and 15 [strikes]," Cash said. "Everything felt fine. We'll see tomorrow and will probably have an update tomorrow on what the next step is."
Desmond Jennings (left-hamstring strain) took part in the game in which Cobb pitched.
Jennings "felt fine," Cash said. "He continued his rehab process. He ran bases and hit live batting practice with the club."
• Chase Whitley, also recovering from Tommy John surgery, will make his second rehab appearance on Sunday for Charlotte vs. Brevard County.
Bill Chastain has covered the Rays for MLB.com since 2005.