Harvey Barnes has named Sean Longstaff as one of the most underrated players at Newcastle. Speaking on Goal’s TikTok page, Barnes was playing a game of Word Association, and he was asked about a number of different things. Barnes stated that Callum Wilson is the biggest maverick at Newcastle, while he named Bruno Guimaraes as the king of the nutmegs. When it came to naming an underrated player at the club, Barnes didn’t hesitate when choosing Longstaff. Sean Longstaff is underratedHarvey Barnes spoke about his teammate. “Underrated?” Barnes was asked “Sean Longstaff,” Barnes said. “Big games?”…