Borussia Dortmund are favourites to land Lorient wing-back Raphael Guerreiro.
The Portuguese is also a target for Liverpool and Barcelona.
However, L'Equipe says Dortmund are the side who have made the biggest, most serious effort for the defender, who is currently with the Portugal squad at the European Championships.
They report that an agreement was reached between both clubs on Friday for a €12 million deal, with a 20 per cent sell on clause included.
The player will sign a four-year deal.