Real Madrid are reportedly showing interest in Bayer Leverkusen's 23-year-old England defender Jarell Quansah. Arsenal previously made a bid for Quansah in the summer, and Chelsea also made an enquiry.
Meanwhile, Liverpool are monitoring Club Tijuana's 17-year-old Mexican midfielder Gilberto Mora. Borussia Dortmund and Benfica are also reportedly keen on the teenage star.
In other transfer news, Roma are still interested in signing Real Madrid striker Endrick, 20, in January, after missing out on a loan move for the Brazil international in the summer.
Elsewhere, Spain and Barcelona midfielder Dani Olmo, 28, reportedly wishes to conclude his career with Dinamo Zagreb. Atletico Madrid are being convinced to make Jonathan David's loan from Juventus a permanent £21m transfer. Inter Milan are reportedly keen on Italy midfielder Alessandro Romano, 20, who is on loan at Cagliari from Roma, and may make a move if Hakan Calhanoglu, 32, leaves next summer.
Bologna have agreed a deal to sign former Manchester United defender Matteo Darmian, 36, on a free transfer after he left Inter Milan. Barcelona and Inter Milan are also monitoring Stuttgart defender Finn Jeltsch, 20, who is attracting Premier League interest.