Tottenham, Liverpool, Manchester United and Manchester City are all in the race for Schalke teenage striker Matthew Hoppe.
Paris Saint-Germain striker Kylian Mbappe, 22, has told the club he will stay at for the remainder of his contract, which expires in 2022.
Tottenham manager Jose Mourinho will not lose his job this season amid a recent run of poor form.
Liverpool and Tottenham both want Aston Villa defender Ezri Konsa.
Manchester City midfielder Ilkay Gundogan, 30, plans to be a manager after he retires as a player.
Southampton are favourites to sign French midfielder Angelo Fulgini from Angers at the end of the season.
Real Betis want to sign Arsenal loanee Dani Ceballos from Real Madrid by offering them the highly-rated Nabil Fekir in part-exchange.