Roenicke said Gomez won't resume physical activity until at least Sunday, one week after sustaining the sprain during the third inning of a 15-5 loss in San Francisco. From there, Gomez will begin light swinging and slowly work his way back into late-game scenarios, pinch-running or as a defensive substitution.
The diagnosis comes just as the Brewers relinquished first place in the National League Central for the first time in nearly five months. The Crew opens a pivotal four-game series against the division-leading Cardinals on Thursday at Miller Park.
"It's never good to lose a good player, a spark plug leadoff guy that can do some damage in the leadoff spot. So it's bad timing," Roenicke said. "I'm happy it's not something worse. You're not talking about surgery, so I'm glad about that."
Roenicke indicated that Gomez's forceful swing could not only have been a contributing factor to the injury, but that it could limit the pace of his return.
"The tough thing with Carlos is because of the way he swings, is how long is it actually going to take before he feels like he's full strength?" Roenicke said.
Scooter Gennett, for the time being, will bat leadoff, where Gomez hit in 88 of his 127 starts with a .274/.345/.394 slash line.
Gennett, a lefty, is hitting .356 with 11 extra-base hits and 15 runs scored in 17 starts at leadoff. Roenicke noted that left-handed-hitting Gerardo Parra could climb the lineup to that spot as matchups dictate.
Parra will also start the bulk of games Gomez's post in center field. He's started there just three times this year, including Monday's series opener against the Cubs. Parra primarily played right field with the D-backs, where he played before coming over at the Trade Deadline.
Monday callup and versatile outfielder Logan Schafer will likely also work his way into the lineup. Roenicke on Monday praised Schafer's defensive versatility, but his bat has remained a question mark. In 53 games with the Brewers this year, Schafer is hitting .183.
Daniel Kramer is an associate reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.