Baseball-Cubs' offer won't be voted on next week-sources

* 'Sooner rather than later'

* 'Negotiations just dragging on'

* Bid must be approved by 75 percent of MLB owners

By Ben Klayman

CHICAGO, May 16 (Reuters) - Major League Baseball owners will not vote next week on whether to approve the Ricketts family's $900 million bid for the Chicago Cubs as some had hoped, two sources familiar with the process said on Saturday.

Officials with Tribune Co, which is selling the team, along with its storied Wrigley Field home and a 25 percent stake in a local sports TV network, said previously they hoped to have the sale closed in May. Sources previously told Reuters the process would likely drag on past that point.

"There's a whole bunch of moving parts here, that's the problem," said one of the sources, who asked not to be identified because he was not authorized to speak on the matter. "It's not going to be this owners' meeting, but it's sooner rather than later."

Tom Ricketts, chief executive of Chicago investment bank Incapital LLC and son of the founder of TD Ameritrade Holding Corp (AMTD.O), is leading his family's bid, which was selected in January as the winning offer. The family is still completing negotiations with Tribune Co, the first source said.

Bidders were eager to take control of the National League team, which despite not winning a World Series title since 1908 has a huge fan base helped by its "lovable losers" image and national exposure on cable TV.