The Uruguay midfielder completed his protracted move from PSG on deadline day yesterday.
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Asked what Ugarte will bring to United, Ten Hag said: "His personality.
"He can control, he has aggressiveness, and the squad and the team need that. I think that he can contribute many things to our team and I am sure that he will have a lot of success.
"He will certainly contribute to our high standards and be instrumental in us achieving our goals."