The 24-year-old Sweden international scored his 19th goal of the season and his eighth in nine Premier League outings in Tuesday’s 1-1 draw with Everton hours after headlines suggested North London rivals Arsenal and Tottenham are ready to battle it out for his signature this summer.However, the Magpies’ head coach is determined to hang on to his £63million record signing, who arrived on Tyneside during the summer of 2022 after learning his trade at AIK Solna, Bundesliga side Borussia Dortmund and Real Sociedad in Spain.Asked about Isak, Howe said: “For me, Alex has limitless potential….