Brown is the kid brother of Sunderland defender and former United star Wes Brown.
"It was the right move," he said. "I'm 20 so to come here and to get a few league games under my belt would be great.
"It's Oldham, so it's still Manchester, it's home still. I know a few players, Kieran Lee and Keanu Marsh [Brown] already, and I know the gaffer as well.
"I've had a great welcome and everything has gone well so far.
"When I go away with England it's always a new mixture of lads, so I'm already used to things like that."