Atletico Madrid fear a late attempt from the Premier League for two of their players.
Kieran Trippier and Saul Niguez have both been the subject of interest of Prem clubs for much of this summer.
Marca says Manchester United remain keen on fullback Trippier, while Chelsea have been in contact about taking Saul on-loan.
Atletico are reluctant to lose both players so late into the transfer window.
Saul's agents have been in talks with Chelsea this past week, while United are convinced an offer of €40m will convince Atletico to sell Trippier.