Hedge fund giant Brevan Howard Asset Management has hired back Chris Cecere, an interest-rates trader who was involved in investigations into efforts to rig benchmark interest rates, people familiar with the matter said.

Cecere last joined Brevan after leaving Citigroup in 2010. He was criticised by Japanese authorities in 2011 for his alleged role in efforts to rig the London Interbank Offered Rate, or Libor, in an investigation that has resulted in billions of dollars of fines for several banks.