Czech President Milos Zeman has been taken to hospital amid political upheaval after a surprise opposition win in parliamentary elections, reports BBC.
He was due to lead talks on forming a new government after Saturday's vote.
Prague's Central Military Hospital director said Mr Zeman was in intensive care for complications from a known condition.
Zeman's has previously said he is suffering from exhaustion and dehydration, after spending eight days in hospital last month.
Zeman was taken to hospital from the presidential chateau outside the capital Prague on Sunday morning, shortly after a meeting with Prime Minister Andrej Babis.