With the final games of the Premier League season imminent, Manchester United and Manchester City will both be hoping to secure a place in the top four of the Premier League.
It's simple: if Manuel Pellegrini's side overcome Swansea City then they will be playing Champions League football in the 2016/17 campaign.
But if City fail to secure all three points then Louis van Gaal's side could pip them to fourth if they beat Bournemouth at Old Trafford.
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It certainly looks set to be a tense afternoon for both sets of supporters, but by the looks of things, City appear to be fairly relaxed.
Indeed, on social media, they've posted a slightly trolling tweet in the direction of Manchester United.
It states that if they draw 0-0 with Swansea and Manchester United beat Bournemouth 26-4 then the two team will have a play-off to decide who will be in next season's Champions League.
It's most definitely amusing, but City fans will be hoping that it doesn't backfire. Unsurprisingly, fans of the Citizens have told the club to delete the tweet. As you can imagine, they don't want it to come back to haunt them if their rivals secure fourth place.
Here are the best tweets:
Update: Manchester United's game against Bournemouth has been delayed after an evacuation at Old Trafford.
Who will claim fourth place in the Premier League? Have your say below!