Stoke City are looking to push through a deal for Bruno Martins Indi this week.
They had faced competition from Crystal Palace for the 25-year-old but now look to have agreed terms with Porto on a £7.25m transfer fee for the Holland international.
Palace have agreed to take Timothy Fosu-Mensah on loan from Manchester United instead.
Stoke have agreed to sign Eric Maxim Choupo-Moting on a free transfer from Schalke and still want to add three more signings before the window closes.