Swansea head coach Francesco Guidolin has been hospitalised with a chest infection and will miss Wednesday's Premier League game at Arsenal.
Swansea said on the club website that the Italian is expected to remain in hospital "for a few days" but said the illness is not serious.
"Guidolin has been struggling with a chest infection for over a week and after failing to respond fully to medical treatment, was referred to a respiratory specialist at a London hospital this afternoon," Swansea said in a statement.
"The specialist felt that the best course of action was for Guidolin to remain in hospital for a few days to receive further treatment. He is in a comfortable position and is expected to recover fully in a few days. Everyone at Swansea City wishes him a speedy recovery."
Swansea said Alan Curties will take over the coaching duties until Guidolin recovers. The Italian had been looking forward to being reunited with former player Alexis Sanchez, who played under Guidolin at Udinese. Guidolin had said he wanted to get Sanchez's shirt after the game - along with three points.