Barone fell ill on Sunday at the team hotel, shortly before Fiorentina's match at Atalanta, and was rushed to a hospital in Milan. The match was subsequently postponed.

Fiorentina said that night that Barone, who turns 58 on Wednesday, was in "critical but stable" condition.

On Monday, the club said Barone remains hospitalised in the cardiac intensive care unit at San Raffaele Hospital in Milan.

"Joe's vital functions are being supported by artificial mechanical support techniques. No prognosis has been set," the club said.

Barone was born in Italy but raised in New York. His wife, Camilla, rushed to Milan from Florence on Sunday and his four children arrived from the United States on Monday morning.

Fiorentina coach Vincenzo Italiano and several of the players also went to the hospital on Sunday. Italian media reports that some of the players were present when Barone fell ill.

Meanwhile Lazio have appointed Igor Tudor as coach following the resignation of Maurizio Sarri, the Serie A club said on Monday.

The former Croatia and Juventus midfielder last coached French side Olympique de Marseille, leaving in June after leading them to a third-place finish. He has also managed Serie A teams Udinese and Verona.

Australian Associated Press