West Ham co-owner David Gold has been taken to hospital to be treated for cholangitis and septicaemia, the club have confirmed.
Gold, 74, was first taken ill on Wednesday evening and was unable to attend the Hammers' Premier League game against Liverpool.
His daughter, Jacqueline, said: ''I saw my dad this morning and he is very poorly with cholangitis (inflammation of the bile duct) and septicaemia.
''He is on powerful antibiotics and we hope to see an improvement in the next few days.
''He asked me to be at the Liverpool game today on his behalf and is absolutely devastated he could not be there himself.''