Racing Santander have landed Khouma Babacar on loan from Fiorentina and let Greek midfielder Alexandros Tziolis move to Monaco.
The Spanish club, just one place outside the Primera Division relegation zone, have also handed an 18-month first-team contract to Villarreal B player Marcos Gullon.
Babacar, 18, featured frequently in the Fiorentina squad but will hope to start more matches at Racing.
His loan deal lasts until the end of June, Racing said in a statement on their official website.
Racing also announced the exit of Tziolis, saying they and Monaco "have reached an agreement for the incorporation" of the player into the French club.