Lammens kept a clean sheet as United won 2-0 on Saturday.
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Amorim later told MUTV: "We need to understand that we need everyone to be ready to play. It's a long season, we have a lot of problems, anything can happen.
"The important thing is that the teammates helped Lammens a lot to have a very good performance."
The manager also said: “Of course it’s so much better to win games. We were a team that were an adult team. We didn’t play well all the game, but we had our moments and we defended well.
"I think Senne did a great job and gave us confidence. It was a good day, not a perfect day, but to win like this with a clean sheet is important for our team.”