The two Black Cats players took part in a challenge which saw the loser have to train on his day off, though some fans suspect both went in anyway.
The atmosphere at Sunderland has truly changed over the past few months, going from an ailing club on the verge of the abyss to a stable outfit gunning for promotion and within one game of a Wembley cup final.
The Black Cats are third in the League One table, three points behind second-placed Luton Town but with a game in hand, and in beating Manchester City Under-21s in the quarter-finals of the Checkatrade Trophy this week, are now in serious contention for some silverware.
While the improvements have largely come about due to a change in ownership, it also helps when there are great characters with the right attitude in the dressing room, and in Luke O’Nien, it seems like Sunderland have got just the man.
The former Wycombe Wanderers player seems to have developed a good working relationship with goalkeeper Jimmy Dunne, the Burnley loanee enjoying a boxing ring sparring session with O’Nien the day after arriving at the Stadium of Light.
This week, O’Nien challenged Dunne to three games of head tennis, with the loser having to come in on his day off today for extra training, and Sunderland’s Twitter account shared how the games panned out.
Here is how some Sunderland fans reacted on social media to the display of camaraderie:
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