Manchester City come to Old Trafford this week for the first leg of their Carabao Cup semi-final.
Pep Guardiola's men come as favourites and will be hoping to take a lead to the Etihad in the second leg later this month.
And with seven games this month, a 14-point deficit to Liverpool in the race for the Premier League title on Guardiola's mind - a crunch collision with rivals Man Utd might be the last thing they need.
Here's everything you need to know about United v City:
Where and when is it?
The match takes place at Old Trafford on Tuesday January 7.

What time is kick-off?
It will get underway at 8 pm.
What channel is it on?
Sky Sports Main Event will show the match live in Ireland, with their coverage for the game starting at 7.30pm.
Betting odds
Man United win: 7/2
Man City win: 4/7
Draw: 10/3
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If you haven't already, be sure to like our Irish Mirror Sport and Irish Mirror GAA pages on Facebook and follow us on Twitter.