He is understood to have held showdown talks with manager Howe, who is said to have left the facility before the Sweden international, as per Newcastle World journalist Charlie Bennett. Isak left around 7pm, meaning he stayed for three hours.
Newcastle play a friendly against Espanyol on Friday but Isak is incredibly unlikely to play. The Magpies kick off their Premier League season against Aston Villa next weekend and will hope to have clarity over the striker's future by then.