Top French football club Paris St-Germain has been criticised following a joke about the team using a private plane for a short journey.
Head coach Christophe Galtier and star player Kylian Mbappé were asked about the French champions' recent jet trip to the western city of Nantes.
Mbappe laughed - and Galtier said the club was looking into the possibility of travelling by sand yacht, instead.
French politicians urged the club to be more responsible over the environment.
PSG won 3-0 at Nantes on Saturday, but the controversy started on Sunday when a senior official from French train operator SNCF tweeted: "Paris-Nantes is less than two hours by TGV (high speed train).
"I renew my proposal of a TGV offer adapted to your specifications, for our common interest: security, speed, services and eco-mobility."
When asked at a news conference on Monday, Galtier and Mbappé looked at each other and the striker burst out laughing.
Galtier then responded: "I knew this question was coming.
"To be perfectly honest with you, this morning we talked about it with the company who organises our trips and we're looking into travelling on sand yachts."