Atletico swooped for Juventus attacker Nico Gonzalez during the day.
The Argentina international joins Atletico on loan with an option to buy, which could become a mandatory transfer if certain conditions are met during the season.
Then later in the evening, Atletico swooped for Slask Wroclaw forward Arnau Ortiz.
The Poland international moves to Atletico for €500,000 and has signed a deal with Atletico to 2028.
Ortiz is set to start his Atletico career with the B team.