All three clubs had scouts present in Turkey on Friday when Iceland stunned their woeful hosts 3-0 in a World Cup qualifier, with Palace certainly there for Tosun – who led the Turkish forward line.
Representatives of Spurs and the Magpies also saw the Besiktas striker in action last week in a 2-0 Champions League win over RB Leipzig.
Reports in Turkey claim the same two Premier League clubs who were said to be watching Tosun when he netted a long-range strike away at Porto on matchday one, were in attendance at Vodafone Arena.
Atletico Madrid and Sevilla also sent scouts to the Champions League match to watch the 26-year-old German-born forward, who set up his side’s opening goal for Ryan Babel.
Tosun scored 20 league goals for the Turkish title-winners last season so it is no surprise that foreign clubs are watching him.
Nantes are reportedly plotting a summer swoop to sign defender Douglas Pereira dos Santos from Barcelona.