The Uruguayan has not hit the ground running at Old Trafford, but did improve under interim boss Ruud van Nistelrooy recently.
Ugarte, a summer arrival from PSG, previously played for Amorim at Sporting CP in Portugal.
Reflecting on his time at Sporting under Amorim, Ugarte told club media: “(The transfer) was so fast! I arrived in January (to sign for Famalicao) and, in June, I was leaving for Sporting.
“It’s one of the biggest clubs in Portugal and I was very proud. I enjoyed my time at Famalicao and also at Sporting. Lisbon is amazing - the city, the people, the club, my team-mates. Everything.
“It is a warm place that treats you well and you make lots of friends. That helped me be successful. I felt comfortable. We had a great coach (Amorim) who helped me a lot, too.”