Koeman uncertain about Messi future
Messi made an attempt to leave Barcelona this summer before backing down. He can talk to other clubs in January and leave for free when his contract expires in June, with Manchester City expected to make a renewed attempt to lure the 33-year-old away from Camp Nou.
"Messi still has a contract and in my opinion he has to stay here," Koeman said in a press conference on Friday, ahead of Saturday's crunch La Liga game away at Atletico Madrid.
After returning from a 15-hour trip back to Barcelona on Wednesday morning following international duty, a frustrated Messi faced questions about his relationship with French forward Antoine Griezmann.
"After such a long trip, to ask Messi about Antoine is a lack of respect, once again to create controversy.
"I have not seen any problem between the two of them, not in the changing room on the training pitch. There are enough pictures who showing them working well together.
"Someone has said something and that someone has not been a client of Griezmann for three years. It's bullshit."
Atletico will go nine points clear of Barca if they win but Diego Simeone's side have not beaten the Catalans in La Liga since 2010.
"Every game is an opportunity and obviously this is it," said Simeone. "We will try to take the game where we can hurt them. They have experience, even with a squad that is being refreshed, young players with experience and an exceptional level.
"It will be hard but we will try to achieve what we have wanted for a long time."
Barcelona will be without the injured Sergio Busquets and Ansu Fati at the Wanda Metropolitano while Atletico's Luis Suarez will be denied the chance to face his former club, after he tested positive for coronavirus, along with his Uruguayan teammate Lucas Torreira.
"We are in a moment in the world in which it can happen and it happened to us," said Simeone.