Newly-elected Western Cape Premier Helen Zille will announce her executive on Friday morning, her office said on Thursday.

The announcement would be followed by a swearing-in ceremony conducted by Constitutional Court Judge Yvonne Mokgoro.

The Democratic Alliance, which Zille leads, toppled the African National Congress from power in the province in last month's election.

She was elected premier by a 24 to 14 majority at the first sitting of the new-look legislature on Wednesday.

Though her party has an absolute majority, Zille has hinted she may give posts in the executive to smaller parties such as the Independent Democrats.