Australian number one Bernard Tomic has accused team-mate Nick Kyrgios of faking illness to avoid the Davis Cup defeat by the USA in Melbourne.
Kyrgios, who missed a match against Czech Republic last year with a back injury, was absent with a virus.
"Twice he has faked it," Tomic was heard telling team captain Lleyton Hewitt during his game with John Isner.
But Hewitt said: "Nick gave everything he had to try to be available and there's no doubt he was sick."
Tomic made the comment, which was picked up by courtside microphones, during a changeover in his four-set defeat by Isner, which gave the USA an unassailable 3-1 lead.