Alexander Isak says promises have been "broken" by Newcastle United and "the relationship can't continue" as he looks to force through an exit this summer.
Nineteen days have passed since Newcastle rejected Liverpool's £110m bid for the Sweden international, who remains in a stand-off with the club over his future.
BBC Sport understands Isak believed he would be allowed to leave Newcastle if a big club came in for him and offered the right price.
On Tuesday, Isak posted a statement on Instagram to explain why he was not in attendance at the Professional Footballers' Association's awards gala, where he was named in the Premier League team of the season.
"I've kept quiet for a long time while others have spoken," he wrote.
