The Nigerian has signed a 3 year deal with the Millers for an undisclosed fee,
During his time at Brentford, the former Everton youth-teamer appeared in nine official matches and spent a portion of last season on loan at Exeter City.
Speaking to the Advertiser, boss Paul Warne said of the signing; "He gives us electric speed, which is what I want, He can play in a three up top if we need him to and he can also play in a position which lets me play with a midfield four. It's a win-win for me."
"He brings a lot of attributes. He's not dissimilar to Matt Olosunde really, I think. We just need to help him on certain aspects of his game. In fairness, most of the players we sign are that sort of project."
"Hopefully we'll get the best out of him and the fans will enjoy watching him run up and down," Warne added.