- Video posted online of Wales players performing semi-naked Haka
- Welsh squad set to be greeted by big crowds in Cardiff Friday
- Wales reached semifinal of Euro 2016 at debut finals
- Last qualified for major tournament in 1958
(CNN)As Wales' Euro 2016 footballers prepared to return home to a rapturous public reception in Cardiff Friday, a video of squad members attempting a raucous, semi-naked war dance behind closed doors was going viral on social media.