Zlatan Ibrahimovic will be out at least one month with a recurrence of his knee injury.

Ibrahimovic was out for seven months following a tear of his ACL.

"It's the same knee, it's the knee with an incredible problem," Jose Mourinho said. "A [36]-year-old man -- a lion, like you say he's a real lion -- but not easy and now he's had a little recurrence and one month out."

United also lost Romelu Lukaku on Saturday.