Ever get busted calling in sick to work -- when you really went to Vegas instead???
That's EXACTLY what happened to a famous rugby player this weekend ... when he decided to rage with international soccer star Zlatan Ibrahimovic -- after he told his squad he was taking care of family in Argentina.
The alleged faker is the pudgy tattooed guy in Zlatan's Vegas party crew -- his name is Martin Castrogiovanni and he plays for the famous French rugby squad, Racing 92.
Martin reportedly told his bosses that he needed to miss the VERY important Champions Cup semi-final game because he needed to attend to a family emergency in Argentina.
Problem is ... Zlatan is internationally famous and paparazzi pics of Ibrahimovic's pool party got back to France.
Now, Martin has reportedly been suspended while the team investigates.