Newcastle's defeat to Tottenham left them without a win in eight Premier League fixtures and tempers boiled over in the tunnel with two players said to have gone head-to-head and exchanged shoves.
Captain Jamaal Lascelles and midfielder Isaac Hayden are those involved in the alleged bust-up, with sources saying that 'in-fighting' has caused more discontent for Steve Bruce's tenure.
Despite taking an early lead on what promised to be a day of celebration following their Saudi-led takeover last week, goals from Tanguy Ndombele, Harry Kane and Son Heung-min cancelled out Callum Wilson's opener before Eric Dier's late own goal.
Read more on dailystar.co.uk