The 25-year-old striker is reportedly still a target for the Magpies' Premier League rivals Arsenal while there are reports Liverpool are preparing a bid, but he has reiterated his despite to focus on his current club.
He told Fotbollskanalen: "There’s not much to say, really. I’ve commented on my situation and my security in Newcastle several times.
"It’s been written how much I love the city and the club, how well I feel there.
"I’m not thinking about the future. I just want to perform for Newcastle. Now we won the cup, but we want to finish strong and qualify for the Champions League. That’s where my focus lies."
Just last week, he scored the winning goal in the Carabao Cup final against Liverpool, securing Newcastle's first trophy in 70 years.
After the final, the Sweden international linked up with the rest of his countryman, and so he's yet to return to the city of Newcastle after the historic win.
He said: "Things like that can’t be described. I think you can only imagine how it feels. But it’s an incredible feeling. Wembley packed with all the Newcastle fans there.
"I’m looking forward to seeing what Newcastle is like as a city after that. I haven’t been back yet."
Isak started his professional career at boyhood club AIK in 2016, before moving onto Borussia Dortmund, during which time he went to Willem II on loan.
He signed with Real Sociedad in 2019, and moved onto Newcastle three years later, going onto score 50 goals in 77 appearances.