Manchester United got Odion Ighalo on loan, West Ham spent big on Jarrod Bowen and Marko Pjaca left Juventus on deadline day.
Lautaro Martinez was sent off for dissent against Cagliari and Inter assistant Cristian Stellini admitted the striker overstepped the mark.
On-loan Cagliari star Radja Nainggolan was on target against parent club Inter in Sunday's 1-1 draw and had mixed feelings after the game.
Inter were held to a third successive 1-1 draw in Serie A on Sunday as Radja Nainggolan cancelled out Lautaro Martinez's opener.
Juventus have left three first-team players out of their travelling party following reports of imminent transfers.
Antonio Conte says Inter have three fit midfielders for their Serie A clash with Cagliari, with Ashley Young a candidate for an early debut.
Romelu Lukaku reflected on his goalscoring exploits for Inter against Cagliari in the Coppa Italia on Tuesday.
Inter claimed a routine win to reach the last eight of the Coppa Italia, putting Cagliari to the sword in a 4-1 triumph.
After netting on his first start since returning to Milan, Zlatan Ibrahimovic revealed he will reserve big celebrations for San Siro.
Milan won and scored for the first time in four Serie A matches, with Zlatan Ibrahimovic netting in the victory over Cagliari.