However, the club is looking to set up a loan-to-buy arrangement with Manchester City initially.
This approach would allow Newcastle to temporarily acquire Grealish's services while negotiating a permanent transfer in the future.
The club is interested in signing Grealish to strengthen their team and improve their chances in the Champions League.
One of the main challenges in acquiring Grealish is his high salary of £300,000 per week, which Manchester City is willing to help cover.
Manchester City is reportedly willing to sell Grealish for £40 million.
There have been rumors about Grealish potentially returning to his former club Aston Villa, but Newcastle's Champions League qualification may give them an advantage in securing his signature.