The tightest of Champions League groups will be decided this week, and potentially Manchester United's January transfer options along with it.
Roma, Manchester City and CSKA Moscow are all locked on five points after five games in Group F, battling for second place behind Bayern Munich who managed to amass 12 already.
Manchester United will have a keen interest despite not being involved, to see what happens to Roma.
The Italian side hold the key to Kevin Strootman, the central midfielder United boss Louis van Gaal is said to prefer to Arturo Vidal.
Strootman has recently returned from a serious knee injury, and will be determined to help Roma beat City this week and put them into the next round.
If the Serie A side are unsuccessful however, United may be in with a chance of bringing the Dutchman in this January.
The Red Devils have been linked with a mid-season bid for the player Van Gaal previously coached at international level, but if Roma make it to the knockout round of the Champions League, United's chances of signing him will also be KO'd.
Roma will take some convincing to sell already, but if they are still in Europe's elite competition in the New Year, there will be no chance, while Strootman himself will be less likely to want to depart.
The fact that it could be City who help nudge him in United's direct by winning in Rome is just another intriguing element to the player's future, but one way or another, what happens to Strootman in January becomes a lot clearer this Wednesday.