According to the Daily Mail, Isaac trained alone on Tuesday and his future is still speculated.
This summer, Isaac has been a target of interest for Liverpool. Newcastle has made it clear that the players are non-selling products, and Liverpool has turned to sign Frankfurt striker Ekitic for 80 million pounds.
In an interview, Isaac's agent said the striker attracted the attention of the Saudi team. According to talkSPORT, Isaac and his agent have made clear his requirements for the new contract, with the Swedish star demanding a weekly salary of £300,000, which will more than double the current weekly salary of Isaac's 120,000, which will break Newcastle's strictly controlled salary structure.
On Tuesday, a fan posted a photo on social media about Isaac training alone, and he appeared to be doing physical training with club staff. The Post said Isaac's future is still speculated.