Zimbabwe election body says poll unlikely in 2011

* Expected 2011 vote not likely, electoral commission says

* Says funding biggest challenge to holding election

* Zimbabwe's voters roll in shambles, reforms needed

HARARE, Aug 27 (Reuters) - Zimbabwe's electoral body does not expect elections planned for next year to take place because it still needs to carry out reforms and is not adequately funded to hold a credible vote, its chief told state media on Friday.

Under the power-sharing arrangement between President Robert Mugabe and Prime Minister Morgan Tsvangirai, fresh elections were set for next year after a referendum on a new constitution.

But the process to write a new charter is nearly a year behind schedule, government officials have said.

"The timeframe is no longer what appears to be envisaged by the political parties because we have a very big task. The biggest challenge is financial resources to conduct elections," Simpson Mutambanengwe, Zimbabwe Electoral Commission chairman was quoted as saying by the Chronicle newspaper.

"We are engaging various stakeholders ... and the political parties over electoral reforms. As it is, the voters' roll is in disarray," Mutambanengwe said.

Zimbabwe's last election in 2008 ended in dispute after Tsvangirai defeated Mugabe but election officials withheld results for five weeks, only to call for a run-off vote which Tsvangirai boycotted blaming violence against his supporters.

Mugabe and Tsvangirai have separately said elections will go ahead next year. Analysts believe the polls could be much later. (Writing by MacDonald Dzirutwe; Editing by Jon Herskovitz and Louise Ireland)