Quoting an unnamed source, The Sun reported Monday that Rooney threatened to "split him in two" when the two next meet.
Ronaldo may be wearing a different uniform when that happens. The British tabloid says United will show Ronaldo the door "because of his World Cup shame."
Ronaldo, who has spoken of moving to Real Madrid, infuriated England players for his actions in United teammate Rooney's ejection Saturday. After Rooney stamped on defender Ricardo Carvalho's groin, Ronaldo rushed to the Argentina referee to complain. When Rooney was shown the red card, moments after shoving Ronaldo, cameras caught Ronaldo winking - apparently at the Portugal bench.
The Daily Mail reported that an irate Rooney tried to get into the Portugal dressing room after the match before senior players stepped in and warned he was putting his career in jeopardy.
Citing a top Football Association source, the Sun reported Rooney's rant came one day after penalty shootout loss to Portugal in the World Cup quarterfinals. Rubbing salt in the wound, Ronaldo converted the penalty kick that sealed the Portuguese win, according to the AP.
The newspaper also said Ronaldo had apparently joked before the game with Rooney that he would get him sent off.
The Sun has joined the anti-Ronaldo bandwagon, printing a mock dartboard with a picture of Ronaldo winking.