The Green's leader, Patrick Harvie, is expected to make the announcement at 5.30pm.

His party was forced out of government by SNP leader Humza Yousaf, who said the power-sharing pact had "served its purpose" and it was "no longer guaranteeing a stable arrangement in parliament".

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Sky sources said there was serious anger among the ousted Greens and it was expected they would not back Mr Yousaf in a Tory-led push to oust him from power next week.

Labour and the Liberal Democrats have already confirmed they will not support the first minister remaining in post.

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