The Florida Marlins are expected to name 80-year old Jack McKeon interim manager, multiple league sources told ESPN The Magazine's Buster Olney late Sunday night.
Edwin Rodriguez unexpectedly resigned Sunday with his team in the midst of a 1-18 June, frustrated with his last-place club after less than one year on the job.
Rodriguez was in his first full season as the Marlins' manager. The Marlins would not have made a change if Rodriguez had not resigned, a team source told ESPN.com's Jayson Stark.
"It's been extremely frustrating for everyone," Florida president of baseball operations Larry Beinfest said. "I think everyone here knows what is going on -- the way we've played, the way we've performed. It's tough on everyone, especially (Rodriguez).
"He communicated with me early this morning that this was something he was thinking about, and when I got to the ballpark we accepted his resignation."
McKeon retired in 2005 after a three-year stint with the Marlins that included a National League Manager of the Year award and a World Series title in 2003. McKeon won both after taking over the Marlins during the season and eventually leading them past the Yankees for the franchise's second championship.
The Marlins won the 1997 World Series with Jim Leyland at the helm.
McKeon has a career record of 1011-940 in 15 seasons as a major league manager. He would be one of only six active managers with at least 1,000 wins.
Rodriguez became interim manager June 23 of last year after Fredi Gonzalez was fired. He was given the job permanently five days later, becoming the first Puerto Rican-born manager in major league history. Florida went 46-46 under Rodriguez, who had opened the season as the Marlins' Triple-A manager in New Orleans.
"This was an extremely frustrated, proud man," Beinfest said. "This kind of caught us a little off guard. I know there's been a lot of speculation, everything, but this is not something I thought was going to happen today."
The Marlins fell to 1-18 in June with Sunday's loss to the Rays. They were 32-40 and in last place in the NL East, 12.5 games behind the Phillies.
Johnson, who led the NL in 2010 with a 2.30 ERA, has been on the disabled list since mid-May with right shoulder inflammation.
Ramirez, the anchor of their lineup, is batting .201 with four homers and 17 RBIs after spending two weeks on the disabled list with an injured back.
Beinfest said the team would move quickly to bring in an interim manager.
"So we can move ahead with the business of playing baseball and trying to win games," he said. "When you have a change like this, with a popular person, I think it's tough on a lot of people. You just need to go play baseball, and that's first and foremost."
Information from The Associated Press contributed to this report.