LEADING political analyst Sean Donnelly has predicted Fianna Fáil could lose all seats in the two Co Donegal constituencies, including Tánaiste Mary Coughlan’s.

Counting is underway in the by-election in Donegal South West, with Sinn Féin's Pearse Doherty apparently on course to take the seat.

Counting will get underway at 9am today in the by-election in Donegal South West.

The Taoiseach has said the by-election in the Donegal South West constituency will be held in 2011, but there is no specific date at this time.