It marked Mount's first goal for the club.
He will face form club Chelsea tomorrow and Ten Hag said: "He's a fantastic football player but it's important first that he is getting and keeping fit because he has had three injuries.
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"We have to do this carefully. The first objective is to keep him fit.
"Then he can benefit and contribute to the team like he did on Saturday when he had a big impact (scoring against Brentford)."