"It's unfortunate for him, and he came into camp in good shape, obviously got off to a good start," A's manager Bob Melvin said earlier this week. "He was eager to impress and have a good spring, and we're still kind of uncertain how long it's going to be, but it's unfortunate obviously."
Even when healthy, Nunez was facing long odds of a roster spot since the A's appear ready to enter the season with a three-man bench. He can play both corner infield positions, plus left field, but so can ultra-utility man Chad Pinder, and the A's would prefer to have a capable center fielder on hand.
Right-hander Raul Alcantara is also out of options but doesn't appear to be in serious consideration for a roster spot, and will likely be designated for assignment. He made his first appearance since March 9 on Friday, allowing one hit in one inning against the Indians.
Right-hander Daniel Mengden, a top contender for one of three open rotation spots, strengthened his case with a solid showing against the Indians, a game which the A's won, 7-3. Mengden allowed just one run and three hits -- including a leadoff homer to Bradley Zimmer -- in 5 2/3 innings, marking the longest outing by an A's starter this spring.
"I was getting ahead, changeup-fastball combo was good," Mengden said. "I feel like everything is coming together."
The A's are prepping for split-squad action on Saturday, with lefty Sean Manaea drawing the 1:05 p.m. PT home start against the Mariners. He'll be paired with battery mate Jonathan Lucroy, who is scheduled to make his A's debut. On the road, right-hander Andrew Triggs will go to battle with the Giants at Scottsdale Stadium in a 4:05 p.m. PT meeting. Watch Triggs on MLB.TV or listen to Manaea on Gameday Audio.
Jane Lee has covered the A's for MLB.com since 2010. Follow her on Twitter @JaneMLB.