The Tigers boss remained coy on the prospect of signing the 20-year-old on-loan Manchester United striker on a permanent basis, but hailed the youngster's work rate and attitude.
Brown added: "What are my chances of keeping him? I don't know.
"I'll have that conversation at the end of the season. We've not even broached the subject to tell you the truth.
"But he's enjoying his football and worked tirelessly tonight."