The U16 forward has left the Gunners to join Brentford's academy.
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Bobb-Semple was a regular with Arsenal U16s last season and featured consistently on the scoresheet, reports Jeorge Bird's Arsenal youth website.
His teammates Demi Akarakiri has joined Everton and Macauley Zepa-Adams is now with Fulham.
It was also announced last week that defender Cory Brew had signed for QPR.