Crystal Palace say manager Roy Hodgson was "taken ill" during training on Thursday morning.
Palace cancelled a news conference after the 76-year-old fell ill.
It was widely reported on Thursday morning that Palace are set to sack Hodgson, with the club 15th in the Premier League and five points clear of the relegation zone.
Palace face Everton at Goodison Park in the Premier League on Monday.
BBC Sport understands that Hodgson is set to lose his job, with former Eintracht Frankfurt boss Oliver Glasner a strong favourite to replace him.
Hodgson took charge of his 200th match as Palace manager earlier this week, but his side were beaten 3-1 at Selhurst Park by Chelsea.
https://www.bbc.co.uk/sport/football/68303964
------------------------------------
They let all the press know that they were going to sack him today, and they wonder why he has taken ill. They should be ashamed