The 22-year-old, who joined the Magpies from Nottingham Forest in 2014, has thrived under Rafa Benitez’s management and his progress is attracting admirers.
According to The Sun, Antonio Conte is considering an £18m deal as he looks to strengthen his defence with home-grown prospects.
Lascelles has popped up on Conte’s radar after impressing Chelsea scouts.
Newcastle are flying high at the top of the Championship with Lascelles starting 14 of their 15 games.
The twice-capped England Under-21 international is under contract at St James’ Park until 2020.
“Jamaal has proven himself to be a leader and a big personality”
Newcastle manager Rafa Benitez
Toon boss Benitez threw Lascelles into the heat of last season’s relegation battle and appointed him captain following their drop to the second-tier.
After appointing Lascelles as captain, Benitez said: “We have a few players now in the squad who have the character to be captain, but Jamaal has proven himself to be a leader and a big personality in the dressing room and on the pitch.
“At the end of last season he really developed as a character and a man.”