Koeman was named Quique Setien’s replacement earlier this week before returning to the Netherlands for a few days.
He returned on Friday afternoon to prepare for confrontational talks with Messi and Bartomeu to plan for the club’s future.
Argentina superstar Messi has turned around and wants to set up a meeting with the club to discuss his future after sending a burofax earlier this week telling them he wanted to leave immediately.
But the club take a tough approach and promise to refuse to meet their star, saying there is “nothing to discuss” unless he arrives to sign a new deal.
“Either it’s to renew [his contract] or there is nothing to discuss, ”the Catalan club told Marca.
Koeman would like to sit down with Messi and Bartomeu to lay the groundwork for what the club will be like next season.
He also wants to be involved in a new attempt to convince Messi to stay and determine the exact situation he is facing.
But Bartomeu would be reluctant after deciding to step down if Messi publicly declares he is the problem and vows to stay if he resigns.
Koeman, meanwhile, reportedly angered Messi when they first met with his bossy approach.
It was alleged in the Spanish press that Koeman told Messi: “The privileges in this team are over, you have to do everything for the team.
“I will be adamant; you only have to think about the team. ”
Barcelona are due to return for the preseason on Monday under Koeman with Messi due to undergo coronavirus testing on Sunday.
The showdown comes with Barcelona refusing to budge from their position and vowing not to sell unless their release clause is met.