Manchester United got Odion Ighalo on loan, West Ham spent big on Jarrod Bowen and Marko Pjaca left Juventus on deadline day.
Barcelona revealed two signings on deadline day, Atletico brought in a familiar face, while Juventus' Emre Can moved to Borussia Dortmund.
Barcelona opted to keep hold of Ousmane Dembele in the face of transfer speculation, but Kevin-Prince Boateng took a swipe at the forward.
Kevin-Prince Boateng has been joined at Fiorentina by former Sassuolo team-mate Pol Lirola.
Sassuolo's chief executive suggested Kevin-Prince Boateng might join Barcelona permanently, but the forward has confirmed his Camp Nou exit.
Zlatan Ibrahimovic would ignore team-mates if things did not go his way in training, according to Kevin-Prince Boateng.
Zlatan Ibrahimovic was the first name that came to Kevin-Prince Boateng's mind in an interview with Barcelona.
Having been sidelined by neck and back pain in recent weeks, Spain star Isco has returned to the Real Madrid squad.
Denis Suarez has been cut from Barcelona's squad to face Sevilla in the Copa del Rey after Kevin-Prince Boateng's signing was ratified.
Barcelona coach Ernesto Valverde has afforded Lionel Messi a rest for the Copa del Rey contest away to Sevilla on Wednesday.