The Reds completed the signing of Bologna striker Joshua Zirkzee, as well as Lille defender Leny Yoro, in July.
A pair of Bayern Munich defenders were added to the squad in August, as former Ajax men Matthijs De Ligt and Noussair Mazraoui were reunited with former boss Erik ten Hag at Old Trafford.
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Several outgoings have also been confirmed, including two to La Liga - Willy Kambwala's move to Villarreal and Donny van de Beek's switch to Girona.
Alvaro Fernandez's loan to Benfica became permanent and Omari Forson linked up with Monza in Italy.