Kalidou Koulibaly and Milan Skriniar are both reportedly wanted by Manchester United and Manchester City.
Linked with a return to Barcelona from Paris Saint-Germain, Neymar could be back at Camp Nou ahead of next season.
Manchester United could welcome Jadon Sancho and see Alexis Sanchez leave permanently.
Jadon Sancho is unlikely to return to Manchester City as "he didn't want to be here", says Pep Guardiola.
With a fee agreed for Leroy Sane's exit to Bayern Munich, we look at who Manchester City might look to as a replacement.
Real Madrid are reportedly ready to battle Manchester United for Jadon Sancho's signature.
Borussia Dortmund chief executive Joachim Watzke is confident Jadon Sancho will not be sold to Liverpool or Manchester United in the window.
Achraf Hakimi is reportedly set for Serie A giants Inter following a two-year loan spell at Borussia Dortmund from Real Madrid.
Jadon Sancho has been linked with the likes of Manchester United and Liverpool, but Borussia Dortmund have received no interest.
Ole Gunnar Solskjaer warned Manchester United's transfer plans could be impacted by the COVID-19 crisis.