British Prime Minister Tony Blair will "make an announcement" on his future as Labor leader on Thursday morning.

Blair would tell cabinet colleagues about his intentions on Thursday morning but would make no public statement in Downing Street before making his plans public in a speech in his Sedgefield constituency, said his official spokesman, the British Broadcasting Corporation (BBC) reported.

The spokesman said Blair would be "focused" on the job of being prime minister until his successor is chosen by Labor in about seven weeks.

Downing Street said earlier that Blair would be "fully engaged" across domestic and international affairs until he goes. These include the reform on health and education, as well as the forthcoming G8 and EU summits.

With heavyweight contesters from the cabinet now all giving up their bid for the Labor leadership so as to keep a united Labor following its blow in the local elections, Chancellor Gordon Brown is the clear favorite to succeed Blair. But he still has to wait about seven weeks to take over.