Mbeumo, a summer arrival from Brentford, scored in Sunday's win at Liverpool.
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"For me has been Manchester United's standout player this season and he hasn't got his rewards for his hard work and the sacrifices he's made for the team," he said on his BBC Podcast.
"It was a great goal. I'll be honest I was a bit sceptical when United signed him, I don't know if he had the ability to come and play for Manchester United, but he's proved me wrong.
"I think he's been a great addition to the team and by far United's best player of the season."