Nomo was injured while pitching to the first batter he faced on Tuesday night against the Seattle Mariners. He stayed in the game and subsequently gave up a run on two hits and also issued a walk.
Athletic trainer Nick Swartz and Nomo decided it would be best if he didn't try to throw on Thursday, the club's last day in Arizona.
"Nick is suggesting, and Nomo agreed, that it's probably better to wait and play catch tomorrow in Milwaukee and see how it feels," manager Trey Hillman said. "So he's not going to play catch today, which was a possibility we talked about yesterday."
Center fielder David DeJesus was not scheduled to play in Thursday's game against the Texas Rangers. He's still recovering from a mild ankle sprain.
"I'm hesitant to play him tomorrow, but we'll see how the flight goes and we'll see how he feels." Hillman said. "I might get him in later, but I doubt if I'll start him. I might put him in for defense at the end, see how that goes, and, hopefully, play him the second day in Milwaukee."
DeJesus is expected to be ready for Monday's opener in Detroit. Nomo's status is uncertain.
"When somebody has any type of strain to the lower part of their body, as a pitcher you have to be careful because it could lead to something else," general manager Dayton Moore said.
Dick Kaegel is a reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.