Sunderland boss Lee Johnson was spotted smirking during Newcastle United's 4-0 defeat to Manchester City at St James' Park on Sunday, which has caused a stir among fans of the League One side. 

Goals from Ruben Dias and Joao Cancelo put Pep Guardiola's side 2-0 up at the break while Riyad Mahrez and Raheem Sterling found the net in the second half to seal a comprehensive win for the visitors.

The result leaves the Magpies only above the bottom of the Premier League table on goal difference while the side below them, Norwich City, have a game in hand.

After drawing 1-1 with Ipswich Town themselves on Saturday, Black Cats fans must've enjoyed seeing their fierce rivals hammered yesterday and Johnson was there to witness the game in person.

The Sunderland boss was spotted in attendance at St James' Park with Sky Sports cameras catching him looking particularly pleased when Newcastle were 4-0 down late on.

Why exactly he was at the game is uncertain, though he may have been on a scouting mission given the Black Cats already have one Manchester City youngster on loan, but his presence has gone down well with the Stadium of Light faithful.

Read their reaction on Twitter here: