It has been reported that Longstaff is considering leaving Newcastle at the end of the season.
The 20-year-old is out of contract at the Magpies in the summer of 2020, and there has been no agreement over a new deal.
The report has claimed that the youngster is considering leaving Newcastle and joining another club on a free transfer.
Borussia Dortmund, Ajax, Club Brugge, Inter Milan and Atalanta all have made contact with the youngster, with Arsenal, Everton and West Ham also interested in securing the services of the England Under-20 international on free transfer, it has been claimed.
The midfielder also made three starts and one substitute appearance in the FA Cup for Steve Bruce’s side so far this campaign, scoring one goal in the process, according to WhoScored.
Newcastle are 13th in the Premier League table at the moment with 35 points from 29 matches.