With the end of the season not long away, there is an expected shake-up on the horizon at Old Trafford, with many Manchester United regulars set to be sent on their way by manager David Moyes.
Nemanja Vidic is the first already poised to leave Old Trafford, and many of his teammates could join the Serbian skipper in heading for the exit door.
Patrice Evra's contract is up, and full-back Rafael has apparently been transfer listed.
So, with so many players on their way out, Manchester United need to get down to some business this summer, and will have to buy a good few replacements.
A potential defender that Moyes could target already resides in Manchester, and has a few England caps to his name as well.
Micah Richards, Manchester City's 25-year-old right-back, would be the ideal replacement for Rafael, and would benefit the United squad indefinitely.
Even if Rafael wasn't to leave, the Manchester United squad is still short. Rafael is their only capable right-back and they still need cover.
Richards joined Manchester City back in 2001, and has since gone on to make 179 appearances for the club. But, new boss Manuel Pellegrini doesn't seem to be his biggest fan, throwing his long-term future at the Etihad Stadium into doubt.
Richards would be a brilliant buy for Moyes. The 25-year-old is young, although still extremely experienced. He would bring the Red Devils more of a sincere attacking threat, whilst shoring up their patchy defending also. Just what the Premier League champions have been looking for.
It would also be a good move for Richards - regular game time, experience at the top level and maybe some European football.
A decent transfer fee would be well received at Manchester City, and give Pellegrini the opportunity to invest elsewhere in his title-challenging squad.
Leaving a club for such a bitter rival is always hard, but for all parties it may be considered a benefit, and an England call could follow if all goes well.