Olakigbe moves to Swindon on-loan to the end of the season.
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The 21-year-old has played eight times in the Premier League for the Bees and has had loan spells with Peterborough United, Wigan Athletic and Chesterfield.
Brentford B manager Sam Saunders explained: "We know his qualities, and this next step at Swindon working under an experienced manager will be important in his development both on and off the pitch."
After putting pen to paper, Olakigbe said: "Very happy to be here, I'm really excited to get going.
"After speaking to the Manager, I had a great feeling. He's worked with so many players, and I felt like he can have a really big impact on my development.