The 25-year-old striker, who was the Premier League's second-highest scorer last season, has not featured in Newcastle's pre-season or their opening match - a goalless draw at Aston Villa. Rumours have swirled that Liverpool made a 110 million pound bid for Isak, which Newcastle rejected, holding out for a British transfer record fee of up to 150 million pounds.
On Tuesday, Isak broke his silence with a revealing Instagram statement after skipping the Professional Footballers' Association awards - where he was named in the Premier League Team of the Year.
"I've kept quiet for a long time while others have spoken," Isak wrote. "Promises were made, and the club has known my position for a long time. When promises are broken and trust is lost, the relationship can't continue. That's where things are for me right now."
Reports suggest Isak was promised a new contract, but Newcastle delayed due to financial fair play restrictions-leading to a breakdown in trust.
Newcastle responded with a statement expressing disappointment but insisting no formal commitment was made for Isak's departure. "Alex remains under contract. We want to keep our best players but understand their wishes," the club said. They also stressed Isak "remains part of our family" and would be welcomed back when ready.
Since arriving from Real Sociedad in 2022, Isak has scored 62 goals in 109 appearances and was pivotal in Newcastle's historic League Cup win this year - their first domestic trophy in 70 years.
Liverpool, meanwhile, are rebuilding after a Premier League title, having spent nearly 300 million pounds and recouped 200 million pounds from sales. They need attacking reinforcements following the departures of Luis Diaz and Darwin Nunez and the tragic death of Diogo Jota - and see Isak as a prime target.
Any transfer deal looks unlikely before the two clubs meet at St James' Park on Monday, adding another layer of tension to an already high-stakes fixture.
Isak's situation highlights the complex balancing act clubs face between financial rules, player ambitions, and competitive goals. Whether he remains a Magpie or becomes a Red will be one of the season's biggest stories.