The West Ham youngsters went down 1-0 to the Black Cats last night in a close game which was settled by Lee Connelly after 14 minutes.
But Westley, the Irons' academy director, saw some positives in spite of the defeat and claims that 20-year-old Browne - who captained the side - was "head and shoulders above" everyone else.
He said to United's official website: "I thought Marcus Browne was head and shoulders better than anyone else on the pitch. He was driving on the ball and the way he led as a captain."
It's an exciting quote from Westley, who has seen his fair share of talent come through the ranks and there is room for a lot of youngsters to make a name for themselves in the youth side over the next five months.
West Ham let Toni Martinez, Reece Burke and Martin Samuelsen leave on loan in January, with Martinez and Samuelsen regularly impressing at that level in the first half of the season so they'll need two new stars.
Whether they can step up to the first team in the long term is unclear, especially given how poor Martinez - arguably the most exciting prospect in the youth set-up - was in the FA Cup defeat at Wigan last month.
But Browne is another highly-rated talent and time will tell whether he has a Premier League future ahead of him.