Having gone head-to-head in the race for a number of signings over recent years, Manchester City and Manchester United and set to battle for the same player once again.
The two Premier League giants battled to sign Alexis Sanchez back in January, with Jose Mourinho beating Guardiola to the signing of the former Arsenal winger.
Reports today now suggest that the two clubs are set to do transfer market battle once again as they both eye up a move for Bayern Munich centre-back Jerome Boateng.
The 29-year-old, who in fact left Manchester City seven years ago, could be available this summer according to The Sun, putting a number of high profile clubs on red alert.
Pep Guardiola is known to be a big fan of the Germany international, having worked with him during his time at the Bavarian club.
Meanwhile, across the city, Jose Mourinho is known to be in need of a new centre-back and has already been linked with the likes of Samuel Umtiti, Raphael Varane and Toby Alderweireld.
However, a potential move will not come cheap, with a price tag of £50 million being speculated for the defender, who is also attracting interest from Real Madrid and Barcelona.