Kevin Pietersen has launched a rant on Twitter after being denied access to a first-class airport lounge because he was wearing flip-flops.

The former England cricketer was travelling from South Africa to Australia with Aussie airline Qantas when he was refused entry to a lounge during a flight connection.

Describing his choice of footwear as "an institution", Pietersen went on to brand the airport staff "muppets".

I suggest you tell Platinum, First Class fliers that they not allowed in your lounges with flip flops before they fly, @Qantas! Muppets! 😡

— Kevin Pietersen (@KP24) December 14, 2015

And BTW, @Qantas! Thongs are an institution in this great country! GET A GRIP! Tired, jet lagged & just wanted to chill! #Muppets 😡

— Kevin Pietersen (@KP24) December 14, 2015