Could Marcos Alonso return to Real Madrid?
In 2010, Marcos Alonso played only a minute for Real Madrid's first team, but he has now been linked with a move back to his childhood club.
After only one appearance for the senior team, Alonso went on to play for Bolton, Fiorentina, Sunderland, and Chelsea.
His performances for the London side have been attracting interest from the Bernabeu.
The Premier League transfer window is now closed, meaning that Chelsea aren't able to bring in any more players, and are unlikely to listen to any offers for the full-back.
Following Real Madrid's defeat to Atletico, Lopetegui could be looking to strengthen his defence ahead of the start of La Liga.
Lopetegui knows Alonso well from his time with Madrid's youth sides.
Relations between Madrid and Chelsea are currently very productive, with the arrival of Courtois at the Bernabeu and the loaning of Kovacic the other way.