The Brazilian will follow Gaizka Mendieta and Dong Gook Lee, who have both been released, out of the exit door at the Riverside when his three-year contract runs out on June 30.
"We both feel that the time is right for Fabio to have a fresh challenge," Southgate said. "He is a talented footballer and I think he´s just had his best season for us, while it was fitting that he should bow out against Manchester City on Sunday with probably his best performance in a Middlesbrough shirt."
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