MIAMI -- Best-case scenario, Omar Infante will be back in the Marlins' starting lineup either on Friday or sometime during the weekend series at Washington.
But manager Ozzie Guillen is in no hurry to rush his second baseman back.
Infante sat out Wednesday and Thursday against the Cubs due to a strained left groin.
There is a concern the problem may linger.
"I worry about those injuries," Guillen said. "That little muscle there, that can be very aggravating. Obviously, you're not going to feel 100 percent in a few days. You've got to stay on top of that."
Until Guillen is convinced Infante is good to go, the Marlins will play Donnie Murphy.
"He's got to give me the right answer for me to play him," Guillen said of Infante. "I'm not in a hurry to play him. Obviously, you want him in the game. If that is not the right answer, we'll keep playing Murphy."
The team also is monitoring left fielder Logan Morrison, who had surgery on his right knee in the offseason.
Morrison isn't expected to play on Friday in Washington. Part of the reason is because the Nationals are going with left-hander Ross Detwiler. Austin Kearns likely will play left field.
"We're going to keep monitoring those guys," Guillen said. "I'm not going to overuse them. I like our bench. Let our bench go out there and do their job. I have a lot of confidence in them, and I think they can do the job, too."