The 18-year-old will join Neil MacFarlane’s squad in Portugal for the Atlantic Cup this term.
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Donovan featured in seven matches for Birmingham before a loan spell at Burton Albion, where he made nine appearances.
Brentford B head coach Neil MacFarlane said: "We look forward to working with Romelle in the months that remain of this season.
“We have a lot of exciting games to be played between now and the end of the season; Romelle will definitely add to our attacking options within the group.
"He is a player who has really good technical abilities aligned to our attacking style of play and he comes into a team that has been performing so well this season. We believe he can add goals and assists to further enhance the current group."