Jose Mourinho has assembled a 25-man senior Manchester United squad and a number of players who have appeared in the first-team are on loan elsewhere.
Mourinho has previously said he would not insist United players respect their contracts if they want to leave.
"I was not even thinking about [selling] Morgan and Memphis," Mourinho said. "We allowed them to go because the right offer arrived, because in the end Everton and Lyon, they fought for the players and players who are not totally happy here because they don't have the minutes they deserve.
"I don't think it's human to stop them to go, only a bad offer or no offer stops them to go but when the offer is correct and we know how to evaluate that I don't think it's human to stop somebody to go.
"So if one of the players are not happy again I will not stop them to go."
Here is a list of United players' contract expiry dates.
Summer 2019
Ander Herrera
Luke Shaw
Juan Mata
Antonio Valencia *
Phil Jones *
Chris Smalling *
Matteo Darmian *
Anthony Martial *
David de Gea *
James Wilson *
Andreas Pereira *
Ashley Young
Summer 2020
Dean Henderson *
Marcus Rashford *
Eric Bailly *
Timothy Fosu-Mensah *
Cameron Borthwick-Jackson *
Nemanja Matic *
Marouane Fellaini *
Lee Grant
Demetri Mitchell
Summer 2021
Jesse Lingard *
Paul Pogba *
Victor Lindelof *
Joel Pereira *
Sergio Romero *
Scott McTominay *
Marcos Rojo *
Summer 2022
Romelu Lukaku *
Alexis Sanchez *
Summer 2023
Fred *
Diogo Dalot *
*Option of an additional year.
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