Robert Lewandowski, Serge Gnabry and Thomas Muller celebrate Bayern Munich's Champions League win – in pictures

Bavarians enjoy the moment after PSG win but the Bundesliga club are already facing a battle to keep hold of key players

Bayern Munich striker Robert Lewandowski, centre, celebrating with team mates during the team banquet after winning the Uefa Champions League final against Paris Saint-Germain in Lisbon. EPA

Bayern Munich's players celebrating during the team banquet after winning the Champions League. EPA

Bayern Munich's Thomas Mueller, centre, celebrates with teammates. EPA

Bayern Munich's players celebrate their Champions league win. EPA

Bayern Munich's Leon Goretzka, top, and Serge Gnabry. EPA

The Bayern Munichsquad celebrate victory. EPA

Bayern Munich's Thiago, centre, celebrating with teammates. EPA

Bayern Munich's Leon Goretzka, top, and Serge Gnabry. EPA

Bayern Munich's Joshua Kimmich, centre, celebrating with teammates. EPA

Bayern Munich manager Hansi Flick, left, sporting director Hasan Salihamidzic. EPA

Bayern Munich chief executive Karl-Heinz Rumenigge. EPA

The celebrations have been going strong since Sunday's Champions League win over Paris Saint-Germain, yet Bayern Munich are already fighting to stop their treble-winning squad from breaking up.

The German giants celebrated through the night in Lisbon after Kingsley Coman's second-half header – Bayern's 500th Champions League goal – sealed a 1-0 win over PSG in Lisbon.

But Bayern are already in danger of losing some key players. Both central midfielder Thiago Alcantara, 29, who has made it clear he wants a fresh challenge and has been linked to Liverpool, and centre-back David Alaba, 28, have stalled over extension talks with a year left on their contracts.

"I don't know," said manager Hansi Flick when asked if Alcantara had played his last Bayern game.

"He doesn't know himself because all the concentration has been 100 percent on the Champions League final."

Flick expects to know more in the "next few days" while board member Oliver Kahn is "very, very" optimistic of keeping hold of Alaba, the only Bayern academy product in the first team but who has been linked to Manchester City.

One Bayern star has already left with Brazil playmaker Philippe Coutinho heading back to Barcelona after a year-long loan deal.

"I will work to make sure that the things that haven't happened so far will happen for me next season," he said, now seeking to reboot his career in a Barcelona side rebuilding after the 8-2 thrashing by Bayern in the quarter-finals.

Bayern now have just a handful of weeks to rest before launching their assault on a ninth-straight Bundesliga title on September 18 at home to Schalke.

There will be reinforcements boosting the squad, though, including ex-Manchester City winger Leroy Sane – who joined from the Premier League side for a fee rising to £55 million (Dh250.8m)  – and former Germany Under-21 goalkeeper Alexander Nuebel, signed on a free transfer from Schalke.